Item #    Description

1              State Code
2              Highway Agency District
3              County (Parish) Code
4              Place Code
5              Inventory Route
6              Features Intersected
7              Facility Carried by Structure
8              Structure Number
9              Location
10            Inventory Route, Minimum Vertical Clearance
11            Kilometer Point
12            Base Highway Network
13            LRS Inventory Route, Subroute Number
19            Bypass, Detour Length
20            Toll
21            Maintenance Responsibility
22            Owner
26            Functional Classification of Inventory Route
27            Year Built
28            Lanes On and Under the Structure
29            Average Daily Traffic
30            Year of Average Daily Traffic
31            Design Load
32            Approach Roadway Width
33            Bridge Median
34            Skew
35            Structure Flared
36            Traffic Safety Features
37            Historical Significance
38            Navigation Control
39            Navigation Vertical Clearance
40            Navigation Horizontal Clearance
41            Structure Open, Posted or Closed to Traffic
42            Type of Service
43            Structure Type, Main
44            Structure Type, Approach Spans
45            Number of Spans in Main Unit
46            Number of Approach Spans
47            Inventory Route, Total Horizontal Clearance
48            Length of Maximum Span
49            Structure Length
50            Curb or Sidewalk Widths
51            Bridge Roadway Width, Curb-to-Curb
52            Deck Width, Out-to-Out
53            Minimum Vertical Clearance Over Bridge Roadway
54            Minimum Vertical Underclearance

Item #    Description

55            Minimum Lateral Underclearance on Right
56            Minimum Lateral Underclearance on Left
58            Deck Condition Rating
59            Superstructure Condition Ratings
60            Substructure Condition Ratings
61            Channel and Channel Protection
62            Culverts Condition Ratings
Method used to Determine Operating Rating
64            Operating Rating
used to Determine Inventory Rating
66            Inventory Rating
67            Structural Evaluation Appraisal Ratings
68            Deck Geometry Appraisal Ratings
69            Underclearances, Vertical & Horizontal Appraisal Rating
70            Bridge Posting
71            Waterway Adequacy Appraisal Ratings
72            Approach Roadway Alignment Appraisal Ratings
75            Type of Work
76            Length of Structure Improvement
90            Inspection Date
91            Designated Inspection Frequency
92            Critical Feature Inspection
93            Critical Feature Inspection Date
94            Bridge Improvement Cost
95            Roadway Improvement Cost
96            Total Project Cost
97            Year of Improvement Cost Estimate
98            Border Bridge
99            Border Bridge Structure Number
100          STRAHNET Highway Designation
101          Parallel Structure Designation
102          Direction of Traffic
103          Temporary Structure Designation
104          Highway System of the Inventory Route
105          Federal Lands Highways
106          Year Reconstructed
107          Deck Structure Type
108          Wearing Surface/Protective System
109          Average Daily Truck Traffic
110          Designated National Network
111          Pier or Abutment Protection [for navigation]
112          NBIS Bridge Length
113          Scour Critical Bridges
114          Future Average Daily Traffic
115          Year of Future Average Daily Traffic
116          Minimum Navigation Vertical Clearance

ITEM 1 - State Code: 2 - Digit FIPS only

01       Alabama

02       Alaska

04       Arizona

05       Arkansas

06       California

08       Colorado

09       Connecticut

10       Delaware

11       District of Columbia

12       Florida

13       Georgia

15       Hawaii

16       Idaho

17       Illinois

18       Indiana

19       Iowa

20       Kansas

21       Kentucky

22       Louisiana

23       Maine

24       Maryland

25       Massachusetts

26       Michigan

27       Minnesota

28       Mississippi

29       Missouri

30       Montana

31       Nebraska

32       Nevada

33       New Hampshire

34       New Jersey

35       New Mexico

36       New York

37       North Carolina

38       North Dakota

39       Ohio

40       Oklahoma

41       Oregon

42       Pennsylvania

44       Rhode Island

45       South Carolina

46       South Dakota

47       Tennessee

48       Texas

49       Utah

50       Vermont

51       Virginia

53       Washington

54       West Virginia

55       Wisconsin

56       Wyoming

60       American Samoa

66       Guam

69       Northern Marianas

72       Puerto Rico

78       Virgin Islands

ITEM 2 - Highway Agency District

The highway agency district (State or Federal) in which the bridge is located represented by a 2-digit code.

ITEM 4 - Place Code

Cities, towns, townships, villages, and other census-designated places identified using the FIPS codes given in the current version of the Census of Population and Housing - Geographic Identification Code Scheme.

ITEM 5 - Inventory Route

The inventory route is a 9-digit code composed of 5 segments.

Length                Segment       Description
1 digit                  5A                  Record Type
1 digit                  5B                  Route Signing Prefix
1 digit                  5C                  Designated level of service
5 digit                  5D                  Route Number
1 digit                  5E                  Directional Suffix

ITEM 5A - Record Type

There are 2 types of NBI records: "ON" and "UNDER".

Code         Description
1                  Route carried "ON" the structure
2                  Single route goes "UNDER" the structure
A - Z             Multiple routes go "UNDER" the structure

ITEM 5B - Record Signing Prefix

Code         Description
1                  Interstate highway
2                  U.S. numbered highway
3                  State highway
4                  County highway
5                  City street
6                  Federal lands road
7                  State lands road
8                  Other

ITEM 5C - Designated Level of Service

Code         Description
0                  None of the below
1                  Mainline
2                  Alternate
3                  Bypass
4                  Spur
6                  Business
7                  Ramp, Wye, Connector, etc.
8                  Service and/or unclassified frontage road

ITEM 5D - Route Number


The route number of inventory route in 5 digits, right justified with leading zeros.



ITEM 5E - Directional Suffix

Code         Description
0                  N/A
1                  North
2                  East
3                  South
4                  West



ITEM 6A - Features Intersected / ITEM 6B - Critical Facility Indicator


These items contain the description of the features intersected by the structure and a critical facility indicator

( no longer coded ).



ITEM 7 - Facility Carried by Structure


The facility being carried by the structure.  In all situations, this item describes the use "on" the structure.



ITEM 8 - Structure Number ​​


A 15 digit structure number unique for each bridge within the stat



ITEM 9 - Location ​​


A narrative description of the bridge location.



ITEM 10 - Inventory Route, Minimum Vertical Clearance


The minimum vertical clearance over the inventory route identified in Item 5, whether the route is "on" the structure or "under" the structure.  Measured in meters.



ITEM 11 - Kilometerpoint


The linear referencing system(LRS) kilometer point is used to establish the location of the bridge on the Base Highway Network(Item 12).



ITEM 12 - Base Highway Network


The Base Highway Network includes the through lane(mainline) portions of the NHS, rural/urban principal arterial system and rural minor arterial system.  Ramps, frontage roads, and other roadways are not included in the Base Network.

Code          Description
0                   Inventory route is not on the Base Network
1                   Inventory route is on the Base Network



ITEMS 13A, 13B - LRS Inventory Route, Subroute Number


If Item 12 - Base Highway Network has been coded 1, the information to be recorded for this item is inventory route for the State's linear referencing system(LRS).  If Item 12 has been coded 0, this entire item is left blank.



ITEM 19 - Bypass, Detour Length


The actual length to the nearest kilometer of the detour length.  It is the total additional travel for a vehicle which would result from the closing of the bridge.



ITEM 20 - Toll


Code           Description
1                  Toll bridge.  Tolls are paid specifically to use the structure.
2                  On toll road.  The structure carries a toll road, i.e. tolls are paid to the facility, which includes both the                             highway and the structure.
3                  On 
free road.  The structure is toll-free and carries a toll-free highway.
4                  On Interstate toll segment under Secretarial Agreement.  Structure functions as apart of the toll segment.
Toll bridge is a segment under Secretarial Agreement.  The structure is seperate agreement from highway                      segment.



ITEMS 21, 22 - Maintenance Responsibility / Owner


Code            Description
01                 State Highway Agency
02                 County Highway Agency
03                 Town or Township Highway Agency
04                 City or Municipal Highway Agency
11                 State Park, Forest, or Reservation Agency
12                 Local Park, Forest, or Reservation Agency
21                 Other State Agencies
25                 Other Local Agencies
26                 Private (other than railroad)
27                 Railroad 31 State Toll Authority
32                 Local Toll Authority
60                 Other Federal Agencies (not listed below)
61                 Indian Tribal Government
62                 Bureau of Indian Affairs
63                 Bureau of Fish and Wildlife
64                 U.S. Forest Service
66                 National Park Service
67                 Tennessee Valley Authority
68                 Bureau of Land Management
69                 Bureau of Reclamation
70                 Corps of Engineers (Civil)
71                 Corps of Engineers (Military)
72                 Air Force
73                 Navy/Marines
74                 Army
75                 NASA
76                 Metropolitan Washington Airports Service
80                 Unknown



ITEM 26 - Functional Classification of Inventory Route


Code            Description

01                  Principal Arterial - Interstate
02                  Principal Arterial - Other
06                  Minor Arterial
07                  Major Collector
08                  Minor Collector
09                   Local 
11                  Principal Arterial - Interstate
12                  Principal Arterial - Other Freeways or Expressways
14                  Other Principal Arterial
16                  Minor Arterial
17                  Collector
19                  Local



ITEM 27 - Year Built


Year of construction of the structure.



ITEMS 28A, 28B - Lanes On and Under the Structure


Number of lanes being carried by the structure and being crossed over by the structure.



ITEM 29 - Average Daily Traffic


Average daily traffic volume for the inventory route identified in Item 5.



ITEM 30 - Year of Average Daily Traffic


Year represented by the ADT(Item 29).



ITEM 31 - Design Load


Code          Metric / English Description
1                  M 9 / H 10
2                  M 13.5 / H 15
3                  MS 13.5 / HS 15
4                  M 18 / H 20
5                  MS 18 / HS 20
6                  MS 18+Mod / HS 20+Mod
7                  Pedestrian
8                  Railroad
9                  MS 22.5 / HS 25
0                  Other or Unknown



ITEM 32 - Approach Roadway Width


Normal width of usable roadway approaching the structure measured in meters.



ITEM 33 - Bridge Median


Code           Description
0                  No median
1                  Open median
2                  Closed median(no barriers)
3                  Closed median with non-mountable barriers



ITEM 34 - Skew


The skew angle is the angle between the centerline of a pier and a line normal to the roadway centerline.
Major variation in skews of substructure units is indicated with 99.



ITEM 35 - Structure Flared


Flared = width of structure varies.
Code            Description
0                    No flare
1                    Yes, flared



ITEM 36 - Traffic Safety Features


Bridge inspection shall include the recording of information on the following traffic safety features so that the evaluation of their adequacy can be made.

Segment     Description
36A               Bridge railings
36B               Transitions
36C               Approach guardrail
36D               Approach guardrail ends


The reporting of these features shall be as follows:
Code         Description
0                  Inspected feature does not meet currently acceptable stds. or a safety feature is required and none is                              provided.*
Inpected peature meets currently acceptable standards.*
N                 Not applicable or a safety feature is not required.*


*  For structures on the NHS, national standards are set by regulation. For those not on the NHS, it shall be the responsibility of the highway agency (state, county, local or federal) to set standards.



ITEM 37 - Historical Significance


Code           Description
Bridge is on the National Register of Historic Places(NRHP).
Bridge is eligible for the NRHP.
Bridge is possibly eligible for the NRHP(requires further investigation before determination can be made)
                    or bridge is on a State or local historic register.
4                  Historical significance is not determinable at this time.
Bridge is not eligible for the NRHP.









ITEM 38 - Navigation Control


Code           Description
N                   Not applicable, no waterway.
0                    No navigation controlonwaterway(bridge permit not required).
1                    Navigation controlonwaterway(bridge permit required).



ITEM 39 - Navigation Vertical Clearance


If Item 38 - Navigation Control has been coded 1, clearance is the minimum vertical clearance imposed at the site as measured above a datum that is specified on a navigation permit issued by a control agency. Measured in meters.



ITEM 40 - Navigation Horizontal Clearance


If Item 38 - Navigation Control has been coded 1, clearance is the horizontal clearance imposed at the site that is shown on the navigation permit. Measured in meters.



ITEM 41 - Structure Open, Posted or Closed to Traffic


Code           Description
A                   Open, no restriction
B                   Open, posting recommended but not legally implemented (all signs not in place or not correctly                                      implemented)
D                   Open, would be posted or closed except for temporary shoring, etc. to allow for unrestricted traffic
E                    Open, temporary structure in place to carry legal loads whileoriginal structure is closed and                                              awaiting replacement or rehabilitation
G                   New structure not yet open to traffic
K                    Bridge closed to all traffic
P                    Posted forload (may include other restrictions such a temporary bridges which are load posted)
R                    Posted for other load-capacity restriction (speed, number of vehicles onbridge, etc.)



ITEMS 42A, 42B - Type of Service On / Under bridge


Type of Service On Bridge
Code            Description
1                     Highway
2                     Railroad
3                     Pedestrian-bicycle
4                     Highway-railroad
5                     Highway-pedestrian
6                     Overpass structure at an interchange or second level of a multilevel interchange
7                     Third level (Interchange)
8                     Fourth level (Interchange)
9                     Building of plaza
0                     Other


Type of Service under Bridge
Code            Description
1                     Highway, with or without pedestrian
2                     Railroad
3                     Pedestrian-bicycle
4                     Highway-railroad
5                     Waterway
6                     Highway-waterway
7                     Railroad-waterway
8                     Highway-waterway-railroad
9                     Relief for waterway
0                     Other



ITEMS 43A, 44A - Kind of material, Main / Approach


Code         Description
1                  Concrete
2                  Concrete continuous
3                  Steel
4                  Steel continuous
5                  Prestressed concrete *
6                  Prestressed concrete continuous *
7                  Wood or timber
8                  Masonry
9                  Aluminum, Wrought Iron or Cast Iron
0**               Other


* Post-tensioned concrete coded as prestressed concrete
** Not applicable for Item 44



ITEMS 43B, 44B - Type of Design, Main / Approach 


Code           Description
01                  Slab
02                  Stringer/Multi-beam or girder
03                  Girder andfloorbeam system
04                  Tee beam
05                  Box beam or girders - Multiple
06                  Box Beam or girders - Single or Spread
07                  Frame
08                  Orthotropic
09                  Truss - Deck
10                  Truss - Thru
11                  Arch - Deck
12                  Arch - Thru
13                  Suspension
14                  Stayed girder
15                  Movable - Lift
16                  Movable - Bascule
17                  Movable - Swing
18                  Tunnel
19                  Culvert
20*                 Mixed types
21                  Segmental box girder
22                  Channel beam
00**               Other


*  Applicable to only approach spans - Item 44.
** Not applicable for Item 44


ITEM 45 - Number of Spans in Main Unit


Number of spans in the main or major unit.



ITEM 46 - Number of Approach Spans


Number of spans in the approach spans to the major bridge, or the number of spans of material different from that of the major bridge.



ITEM 47 - Inventory Route, Total Horizontal Clearance


The total horizontal clearance for the inventory route identified in Item 5 measured in meters. It is the available clearance measured between the restrictive features -- curbs, rails, walls, piers or other structural features limiting the roadway (surface and shoulders).  When the restriction is 100 meters or greater, code could be 999.



ITEM 48 - Length of Maximum Span


The length of maximum span.  It shall be noted whether the measurement is center of bearing points or clear open distance between piers, bents or abutments.  The measurement shall be along the centerline of the bridge. Measured in meters.



ITEM 49 - Structure Length


The length of the structure measured in meters.  This shall be the length of roadway which is supported on the bridge structure. 
The length is measured back to back ofbackwalls of abutments or from paving notch to paving notch. Culvert lengths are measured along the center line of roadway regardless of their depth below grade. Measurement is made between inside faces of exterior walls. Tunnel length is measured along the centerline of the roadway.



ITEMS 50A, 50B - Curb or Sidewalk Widths (Left / Right)


The widths of the left and right curbs or sidewalks measured in meters. "Left" and "Right" is determined on the basis of direction of the inventory.



ITEM 51 - Bridge Roadway Width, Curb-to-Curb


The most restrictive minimum distance between curbs or rails on the structure roadway measured in meters.



ITEM 52 - Deck Width, Out-to-Out


The out-to-out width measured in meters.



ITEM 53 - Minimum Vertical Clearance Over Bridge Roadway


The actual minimum vertical clearance over the bridge roadway, including shoulders, to any superstructure restriction, measured in meters.  When no superstructure restriction exists above the bridge roadway, or when a restriction is 30 meters or greater, indicated as 99.99.


ITEM 54A - Minimum Vertical Underclearance - Reference feature


The reference feature from which the clearance measurement is taken:
Code          Description
H                  Highway beneathstructure
R                   Railroad beneathstructure
N                  Feature not a highway or railroad


ITEM 54B - Minimum Vertical Underclearance


The minimum vertical clearance from the roadway(travel lanes only) or railroad track beneath the structure to the underside of the superstructure.  Measured in meters.



ITEM 55A - Minimum Lateral Underclearance - Reference feature


The reference feature from which the clearance measurement is taken:
Code           Description
H                   Highway beneathstructure
R                    Railroad beneathstructure
N                   Feature not a highway or railroad



ITEM 55B - Minimum Lateral Underclearance on Right


The minimum lateral underclearance on the right measured in meters.



ITEM 56 - Minimum Lateral Underclearance on Left


The minimum lateral underclearance on the left measured in meters.



ITEMS 58, 59, 60 - Condition ratings: Deck, Superstructure, Substructure


Code         Description
N                 NOT APPLICABLE


9                  EXCELLENT CONDITION


8                  VERY GOOD CONDITION - no problems noted.


7                  GOOD CONDITION - some minor problems.


6                  SATISFACTORY CONDITION - structural elements show some minor deterioration.


5                  FAIR CONDITION - all primary structural elements are sound but may have minor section loss,                                        cracking, spalling or scour.

4                  POOR CONDITION - advanced section loss, deterioration, spalling or scour.


3                  SERIOUS CONDITION - loss of section, deterioration of primary structural elements.  Fatigue cracks in                          steel or shear cracks in concrete may be present.

2                  CRITICAL CONDITION - advanced deterioration of primary structural elements. Fatigue cracks in steel or                      shear cracks in concrete may be present or scour may have removed substructure support. Unless closely                      monitored it may be necessary to close the bridge until corrective action is taken.

1                  "IMMINANT" FAILURE CONDITION - major deterioration or section loss present in critical structural                                components or obvious vertical or horizontal movement affecting structure stability.                                                          Bridge is closed to traffic but corrective action may put it back in light service.       

0                  FAILED CONDITION - out of service; beyond corrective action.



ITEM 61 - Channel and Channel Protection


Code         Description
N                 Not applicable.


9                  There are no noticeable or noteworthy deficiencies which affect the condition of the channel.


8                  Banks are protected or well vegetated.  River control devices such as spur dikes and embankment                                  protection are not required or are in a stable condition.

7                  Bank protection is in need of minor repairs.  River control devices and  embankment protection have a                            little minor damage.  Banks and/or channel have minor amounts of drift.

6                  Bank is beginning to slump.  River control devices and embankment protection have widespread minor                          damage. There is minor stream bed movement evident.  Debris is restricting thechannel slightly.    

5                  Bank protection is being eroded.  River control devices and/or embankment have major damage.  Trees                        and brush restrict the channel.

4                  Bank and embankment protection is severely undermined.  River control devices have severe damage.                          Large deposits of debris are in the channel.

3                  Bank protection has failed.  River control devices have been destroyed. Stream bed aggradation,                                    degradation or lateral movement has changed the channel to now threaten the bridge and/or approach                        roadway.

2                  The channel has changed to the extent the bridge is near a state of collapse.


1                  Bridge closed because of channel failure.  Corrective action may put back in light service.


0                  Bridge closed because of channel failure.  Replacement necessary.



ITEM 62 - Culverts


Code         Description
N                 Not applicable.  Used ifstructure is not a culvert.


9                  No defeciencies


8                  No noticeable or noteworthy deficiencies which affect the condition of the culvert. Insignificant                                        scrape marks caused by drift.

7                  Shrinkage cracks, light scaling and insignificant spalling which does not expose reinforcing steel.                                      Insignificant damage caused by drift with no misalignment and not requiring corrective action.  Some                            minor scouring has occured near curtain walls, wingwalls or pipes.  Metal culverts have a smooth                                      symmetrical curvature with superficial corrosion and no pitting.

6                  Deterioration or initial disintegration, minor chloride contamination, cracking with some leaching,                                   or spalls on concrete or masonry walls and slabs.  Local minor scouring at curtain walls, wingwalls or                               pipes. Metal culverts  have a smooth curvature, non-symmetrical shape, significant corrosion or moderate                      pitting.

5                  Moderate to major deterioration or disintegration, extensive cracking and leaching or spalls on                                        concrete  or masonry walls and slabs.  Minor settlement or misalignment.  Noticeable scouring                                        or erosion at curtain walls, wingwalls or pipes. Metal culverts have significant distortion and deflection in                        one section, significant corrosion or deep pitting.

4                  Large spalls, heavy scaling, wide cracks, considerable efflorescence or opened construction joint                                      permitting loss of backfill.  Considerable settlement or misalignment.  Considerable scouring or erosion                        at curtain walls, wingwalls or pipes.  Metal culverts have significant distortion and deflection                                              throughout, extensive corrosion or deep pitting.

3                  Any condition described in Code 4 but which is excessive in scope.  Severe movement or differential                              setlement of the segments or loss of fill.  Holes may exist in walls or slabs.  Integral wingwalls nearly                                severed from culvert.  Severe scour or erosion at curtain walls, wingwalls or pipes.  Metal culverts have                            extreme distortion and delection in one section, extensive corrosion, or deep pitting with scattered                                perforations.

2                  Integral wingwalls collapsed, severe settlement of roadway due to loss of fill. Section of culvert may have                        failed and can no longer support embankment. Complete undrmining at curtain walls and pipes.                                    Corrective action required to maintain traffic.  Metal culverts have extreme distortion and deflection                                and deflection throughout with extensive perforations due to corrosion.

1                  Bridge closed.  Corrective action may put back in light service.


0                  Bridge closed.  Replacement necessary.



ITEMS 63, 65 - Method Used to Determine: Operating Rating / Inventory Rating


Code         Description
1                  Load Factor(LF)
2                  Allowable Stress(AS)
3                  Load and Resistance Factor(LRFR)
4                  Load Testing
5                  No rating analysis performed




ITEM 64 - Operating Rating


This capacity rating referred to as the operating rating, will result in the absolute maximum permissible load level to which the structure may be subjected for the vehicle type used in the rating.  Represents the total mass of the entire vehicle measured in metric tons.  If the bridge will not carry a minimum of 2.7 metric tons of live load, the operating rating is 0 metric tons.



ITEM 66 - Inventory Rating


This capacity rating referred to as the inventory rating, will result in a load level which can safely utilize an existing structure for an indefinite period of time.  Coded as '999' for a structure under sufficient fill such that, according to AASHTO design, the live load is insignificant in the structure load capacity.



ITEMS 67, 68, 69, 71, 72 - Appraisal ratings


- Structural Evaluation
- Deck Geometry
- Underclearances, Vertical and Horizontal
- Water Adequacy
- Approach Roadway Alignment


Code         Description
N                 N/A
9                  Superior to present desirable criteria
8                  Equal to present desirable criteria
7                  Better than present minimum criteria
6                  Equal to present minimum criteria
5                  Somewhat better than minimum adequacy to tolerate being left in place as is
4                  Meets minimum tolerable limits to be left in place as is
3                  Basically intolerable requiring high priority of corrrective action
2                  Basically intolerable requiring high priority of replacement
1                  This value of rating code not used
0                  Bridge closed​



ITEMS 70 - Bridge Posting


Code         Description
5                  Equal to or above legal loads
4                  00.1  -  09.9 % below
3                  10.0  -  19.9 % below
2                  20.0  -  29.9 % below
1                  30.0  -  39.9 % below
0                        >  39.9% below​



ITEM 75A - Type of Work


Code          Description
31                 Replacement of bridge or other structure because of substandard load carrying 
                     capacity or substantial bridge roadway geometry.

32                 Replacement of bridge or other structure because of relocation of road.

33                 Widening of existing bridge or other major structure without deck rehabilitation
                     or replacement; includes culvert lengthening.

34                 Widening of existing bridge with deck rehabilitation or replacement.

35                 Bridge rehabilitation because of general structure deterioration or inadequate strength.

36                 Bridge deck rehabilitation with only incidental widening.

37                 Bridge deck replacement with only incidental widening.

38                 Other structural work, including hydraulic replacements.​



ITEM 75B - Work Done By


Code            Description
1                     Work to be done by contract
2                     Work to be done by owner's forces



ITEM 76 - Length of Structure Improvement


This is the length of the proposed bridge improvement measured in meters.



ITEM 90 - Inspection Date


This is the month(2-digits) and year(4-digits) of the last routine inspection of the structure performed.



ITEM 91 - Designated Inspection Frequency


This is the number of months between designated inspections of the structure.



ITEMS 92A, 92B, 92C - Critical Feature Inspection


- Fracture Critical Details
- Underwater Inspection
- Other Special Inspection


1st digit
Code            Description
Y                     Special inspection or emphasis needed
N                    Not needed


2nd and 3rd digit
2 - digit number to indicate the number of months between inspections only if the first digit is coded 'Y'.

ITEMS 93A, 93B, 93C - Critical Feature Inspection Date


If the first digit of Item 92 is coded 'Y' then the first 2 - digits represent the month and last 2 - digits represent the year that the last inspection of the denoted critical feature was performed.



ITEM 94 - Bridge Improvement Cost


Estimated cost of the proposed bridge or major structure improvements in thousands of dollars.  This cost shall  include only bridge construction costs, excluding roadway, right of way, detour, demolition, prelimnary engineering, etc.



ITEM 95 - Roadway Improvement Cost


Estimated cost of the proposed roadway improvement in thousands of dollars.  This shall include only roadway  construction costs, excluding bridge, right-of-way, detour, extensive roadway realignment costs, preliminary  engineering, etc.



ITEM 96 - Total Project Cost


Estimated total project costs associated with the proposed bridge improvement project in thousands of dollars, including incidental costs not included in Items 94 and 95.  The total project cost will therefore be greater than the sum of Items 94 and 95.



ITEM 97 - Year of Improvement Cost Estimate


The 4 - digit year that the costs of work estimated in Items 94, 95 and 96 were based upon. 



ITEM 98 - Border Bridge


This item indicates structures crossing borders of States.

Segment        Description
98A                  Neighboring State Code[ 3 digits ]
98B                  Percent Responsibility*[ 2 digits ] 
* - Percentage of total deck area of the existing bridge that the neighboring State is responsible for funding.

If the structure is not on a border, left blank.



ITEM 99 - Border Bridge Structure Number


This item indicates neighboring State's 15-Digit NBI structure number for any structure noted in Item 98.
Blank if Item 98 is blank.



ITEM 100 - STRAHNET Highway Designation


Code         Description
1                  The inventory route is not a STRAHNET route.
2                  The inventory route is on a Interstate STRAHNET route.
3                  The inventory route is on a Non-Interstate STRAHNET route.
4                  The inventory route is on a STRAHNET connector route


ITEM 101 - Parallel Structure Designation


Code          Description
R                  The right structure of parallel bridges carrying the roadway in the direction of the inventory.                                               ( For a STRAHNET highway, this is west to east and south to north. )
L                   The left structure of parallel bridges.  This structure carries traffic in the opposite direction.
N                  No parallel structure exists.​



ITEM 102 - Direction of Traffic


Code         Description
0                  Highway traffic not carried
1                  1 - way traffic
2                  2 - way traffic
3                  One lane bridge for 2 - way traffic​



ITEM 103 - Temporary Structure Designation


Code          Description
T                   Temporary structure(s) or conditions exist.


Blank if not applicable.



ITEM 104 - Highway System of the Inventory Route


Code         Description
0                  Inventory Route is not on the NHS.
1                  Inventory Route is on the NHS.​



ITEM 105 - Federal Lands Highway


Code         Description
0                  N/A
1                  Indian Reservation Road (IRR)
2                  Forest Highway (FH)
3                  Land Management Highway System (LMHS)
4                  Both IRR and FH
5                  Both IRR and LMHS
6                  Both FH and LMHS
9                  Combined IRR, FH and LMHS​



ITEM 106 - Year Reconstructed


4 - digit year of most recent reconstruction of the structure.  If there has been no reconstruction, year is 0.



ITEM 107 - Deck Structure Type


Code          Description
1                   Concrete Cast-in-Place
2                   Concrete Precast Panels
3                   Open Grating
4                   Closed Grating
5                   Steel plate (includes orthotropic)
6                   Corrugated Steel
7                   Aluminum
8                   Wood or Timber
9                   Other
N                  Not applicable​



ITEM 108 - Wearing Surface/Protective System


Information on the wearing surface and protective system of the bridge deck is composed of 3 segments.

Length               Segment         Description
1 digit                  108A                  Type of Wearing Surface
1 digit                  108B                  Type of Membrane
1 digit                  108C                  Deck Protection



ITEM 108A - Type of Wearing Surface


Code          Description
1                  Monolithic Concrete (concurrently placed with structural deck)
2                  Integral Concrete (separate non-modified layer of concrete added to structural deck)
3                  Latex Concrete or similar additive
4                  Low slump Concrete
5                  Epoxy Overlay
6                  Bituminous
7                  Wood or Timber
8                  Gravel
9                  Other
0                  None (no additional concrete thickness or wearing surface is included in the bridge deck)
N                 Not applicable (applies only to structures with no deck)​



ITEM 108B - Type of Membrane


Code         Description
1                  Built-up
2                  Preformed Fabric
3                  Epoxy
8                  Unknown
9                  Other
0                  None
N                 Not applicable (applies only to structures with no deck)​



ITEM 108C - Deck Protection


Code          Description
1                   Epoxy Coated Reinforcing
2                   Galvanized Reinforcing
3                   Other Coated Reinforcing
4                   Cathodic Protected
6                   Polymer Impregnated
7                   Internally Sealed
8                   Unknown
9                   Other
0                   None
N                  Not applicable (applies only to structures with no deck)

ITEM 109 - Average Daily Truck Traffic


The percentage that shows the percentage of Item 29 - Average Daily Traffic that is truck Trafic.



ITEM 110 - Designated National Network


Code         Description
0                  The inventory route is not part of the national network for trucks.
1                  The inventory route is part of the national network for trucks.​



ITEM 111 - Pier or Abutment Protection


Code          Description
1                   Navigation protection not required
2                   In place and functioning
3                   In place but in a deteriorated condition
4                   In place but re-evaluation of design suggested
5                   None present but re-evaluation suggested



ITEM 112 - NBIS Bridge Length


Does this structure meet or exceed the minimum length specified to be
designated as a bridge for National Bridge Inspection Standards purposes?

Code          Description
Y                   Yes
N                  No



ITEM 113 - Scour Critical Bridges


Code          Description
N                  Bridge not over waterway.


U                  Bridge with "unknown" foundation that has not been evaluated for scour. Until risk can be determined, a                       plan of action should be developed and implemented to reduce the risk to users from abridge failure                             during and immediately after a flood event (see HEC 23).

T                  Bridge over "tidal" waters that has not been evaluated for scour, but considered low risk. 
                    Bridge will be monitored with regular inspection cycle and with appropriate underwater inspections until                        an evaluation is performed ("Unknown" foundations in"tidal" waters should be coded U.)

9                  Bridge foundations (including piles) on dry land well above flood water elevations.


8                  Bridge foundations determined to be stable for the assessed or calculated scour condition. 
                    Scour is determined to be above top of footing (Example A) by assessment (i.e., bridge foundations are                        on rock formations that have been determined to resist scour within the service life of the bridge4), by                            calculation or by installation of properly designed countermeasures (see HEC 23).
7                   Countermeasures have been installed to mitigate an existing problem with scour and to reduce the risk                         of bridge failure during a flood event. Instructions contained in a plan of action have been implemented                         to reduce the risk to users from a bridge failure during or immediately after a flood event.

6                  Scour calculation/evaluation has not been made. (Use only to describe case where bridge has not yet                            been evaluated for scour potential.)

5                  Bridge foundations determined to be stable for assessed or calculated scour condition. 
                    Scour is determined to be within the limits of footing or piles (Example B) by assessment (i.e.,bridge                                foundations are on rock formations that have been determined to resist scour within the service life of the                      bridge), by calculations or by installation of properly designed countermeasures (see HEC 23).
4                  Bridge foundations determined to be stable for assessed or calculated scour conditions; 

                    field review indicates action is required to protect exposed foundations (see HEC 23).
3                  Bridge is scour critical; bridge foundations determined to be unstable for assessed or calculated scour                            conditions:
                       - Scour within limits of footing or piles. (Example B)
                       - Scour below spread-footing base or pile tips. (Example C)
2                  Bridge is scour critical; field review indicates that extensive scour has occurred at bridge foundation,  
                    which are determined to be unstable by:
                       - a comparison of calculated scour and observed scour during the bridge inspection, or
                       - an engineering evaluation of the observed scour condition reported by the bridge inspector in Item 60.

1                  Bridge is scour critical; field review indicates that failure of piers/abutments is imminent. Bridge is closed 
                    to traffic. Failure is imminent based on:
                       - a comparison of calculated and observed scour during the bridge inspection, or
                       - an engineering evaluation of the observed scour condition reported by the bridge inspector in Item 60.

0                   Bridge is scour critical. Bridge has failed and is closed to traffic.




ITEM 114 - Future Average Daily Traffic


The forecasted average daily traffic(ADT) for the inventory route identfied in Item 5 .



ITEM 115 - Year of Future Average Daily Traffic


Year represented by the future ADT in Item 114.



ITEM 116 - Minimum Navigation Vertical Clearance, Vertical Lift Bridge


The minimum vertical clearance imposed at the site as measured above a datum that is specified on a navigation permit issued by a control agency.  Measured in meters.



Deck area


This is Deck width( ITEM 52 ) times Structure length( ITEM 49 ) or ITEM_52 x ITEM_49.





The first 2 digits are the Federal Information Processing Standards (FIPS) code for Item 1, and the last 3 digits are the code for Item 3.





Code         Description
0                  Not defecient
1                  Structurally defecient
2                  Functionally obsolete
N                 Not applicable



Sufficiency rating


The sufficiency is a method of evaluating highway bridge data by calculating four separate factors to obtain a numeric value which is indicative of bridge sufficiency to remain in service. The result of this method is a percentage in which 100 percent would represent a entirely sufficient bridge and zero percent would represent an entirely insufficient or deficient bridge.


Structurally defecient(SD) & Functionally obsolete(FO) Criteria


Below are the definitions for SD criteria and FO criteria in this application. It must be noted 
that, based on the criteria used, a bridge could be both structurally deficient and functionally obsolete.

The status field however provides the option of running a query in which a bridge designated as functionally obsolete is not structurally deficient. In other words functionally obsolete bridges are exclusive of structurally deficient bridges. 
Also, the status field definition of bridge deficiencies is limited only to those bridges which are 10 years or older and are more than 20 feet in length.



Definition of SD criteria 

SD(Structurally deficient) criteria are defined as bridges that meet at least one of the following qualifications:


1.      ITEM 58  coded 0, 1, 2, 3 or 4;  or
2.      ITEM 59  coded 0, 1, 2, 3 or 4;  or
3.      ITEM 60  coded  0, 1, 2, 3 or 4; or
4.      ITEM 62 coded 0, 1, 2, 3 or 4; and the last two digits of ITEM 43 are coded 19; or
5.      ITEM 67 coded 0, 1 or 2; or
6.      ITEM 71 coded 0, 1 or 2 and the last digit of ITEM 42 coded 0, 5, 6, 7, 8 or 9.



Definition of FO criteria  

FO(Functionally Obsolete) criteria are defined as bridges that meet at least one of the following qualifications:

1.      ITEM 68 coded 0, 1, 2 or 3; or
2.      ITEM 69 coded 0, 1, 2 or 3 and the last digit of ITEM 42 coded 0, 1, 2, 4, 6, 7 or 8; or
3.      ITEM 72 coded 0, 1, 2 or 3; or
4.      ITEM 67 coded 3; or
5.      ITEM 71 coded 3 and the last digit of ITEM 42 coded 0, 5, 6, 7, 8 or 9.


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