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National Bridge Inventory

Every bridge and culvert longer than 20 feet on a public road in Massachusetts, as the state, local and federal agencies that own them report them to the Federal Highway Administration (FHWA) each year: where each one is, the route it carries and what it crosses, who owns it, when it was built and rebuilt, how long and wide it is, its traffic and truck share, the condition of its deck, superstructure, substructure or culvert, whether it is in good, fair or poor condition, its load rating and posting, how vulnerable it is to scour, and the work proposed for it and its estimated cost. Good for finding the poor, posted or closed bridges in a county or on a corridor, the bridges a freight route or detour depends on, and where repair and replacement needs are concentrated.

Published by
Federal Highway Administration, Office of Bridges and Structures
Source
NBI (FHWA National Bridge Inventory)
Original data
www.fhwa.dot.gov
Terms of use
Public domain (work of the U.S. government); acknowledge FHWA and BTS
On the map
Points

From the publisher

The following datasets represent bridge data submitted annually to FHWA by the States, Federal agencies, and Tribal governments in accordance with the National Bridge Inspection Standards and the Recording and Coding Guide for the Structure Inventory and Appraisal of the Nations Bridges. Each dataset is submitted in the spring, and may be corrected or updated throughout the year. The data for public highway bridges is considered final and is published on this website by June 15th of each calendar year.

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Fields

What each record holds, as the publisher describes it: 165 fields.

FieldDescription
(file year)
Inventory year, 2025
(file state)
State code, MA
STATE_CODE_001
State FIPS code, 25
STRUCTURE_NUMBER_008
The bridge's structure number, leading spaces removed
STATE_CODE_001, COUNTY_CODE_003
County FIPS code, five digits
ROUTE_PREFIX_005B
Route signing: Interstate highway, U.S. numbered highway, State highway, County highway, City street, …
ROUTE_PREFIX_005B
The same, as FHWA's code
SERVICE_LEVEL_005C
Mainline, Alternate, Bypass, Spur, Business, Ramp, wye or connector, Service or frontage road, None
SERVICE_LEVEL_005C
The same, as FHWA's code
ROUTE_NUMBER_005D
Route number carried, five digits
DIRECTION_005E
Directional suffix of the route: North, East, South, West, Not applicable
DIRECTION_005E
The same, as FHWA's code
HIGHWAY_DISTRICT_002
The state transportation department's district
PLACE_CODE_004
Census place code, five digits; 00000 outside a place
FEATURES_DESC_006A
What the bridge crosses
FACILITY_CARRIED_007
What the bridge carries
LOCATION_009
Where the bridge is, in words
MIN_VERT_CLR_010
Minimum vertical clearance over the bridge roadway, meters; 99.99 is no restriction
KILOPOINT_011
Kilometer point on the route
BASE_HWY_NETWORK_012
On the base highway network
LRS_INV_ROUTE_013A
Linear referencing system route id
SUBROUTE_NO_013B
Linear referencing system subroute
LAT_016
Latitude, decimal degrees
LONG_017
Longitude, decimal degrees (negative)
DETOUR_KILOS_019
Added length of the shortest detour, km
TOLL_020
Toll bridge, On toll road, On free road, …
TOLL_020
The same, as FHWA's code
MAINTENANCE_021
Agency responsible for maintenance
MAINTENANCE_021
The same, as FHWA's code
OWNER_022
Owning agency: State highway agency, County highway agency, City or municipal highway agency, …
OWNER_022
The same, as FHWA's code
FUNCTIONAL_CLASS_026
Functional class of the route on the bridge, Rural: Minor arterial, Urban: Local, …
FUNCTIONAL_CLASS_026
The same, as FHWA's code
YEAR_BUILT_027
Year built
TRAFFIC_LANES_ON_028A
Traffic lanes on the bridge
TRAFFIC_LANES_UND_028B
Traffic lanes under the bridge
ADT_029
Average daily traffic
YEAR_ADT_030
Year of the traffic count
DESIGN_LOAD_031
Design live load: HS 20, HL 93, …
DESIGN_LOAD_031
The same, as FHWA's code
APPR_WIDTH_MT_032
Approach roadway width, meters
MEDIAN_CODE_033
No median, Open median, Closed median, …
MEDIAN_CODE_033
The same, as FHWA's code
DEGREES_SKEW_034
Skew angle, degrees; 99 is a varying skew
STRUCTURE_FLARED_035
Width varies (flared)
RAILINGS_036A
Bridge railings: Meets standards, Does not meet standards, Not required
RAILINGS_036A
The same, as FHWA's code
TRANSITIONS_036B
Railing transitions, as railings
TRANSITIONS_036B
The same, as FHWA's code
APPR_RAIL_036C
Approach guardrail, as railings
APPR_RAIL_036C
The same, as FHWA's code
APPR_RAIL_END_036D
Approach guardrail ends, as railings
APPR_RAIL_END_036D
The same, as FHWA's code
HISTORY_037
On or eligible for the National Register of Historic Places, …
HISTORY_037
The same, as FHWA's code
NAVIGATION_038
Whether the waterway below has navigation control
NAVIGATION_038
The same, as FHWA's code
NAV_VERT_CLR_MT_039
Navigation vertical clearance, meters
NAV_HORR_CLR_MT_040
Navigation horizontal clearance, meters
OPEN_CLOSED_POSTED_041
Open, no restriction; Posted for load; Closed to all traffic; …
OPEN_CLOSED_POSTED_041
The same, as FHWA's code
SERVICE_ON_042A
What the bridge carries: Highway, Highway-pedestrian, Railroad, …
SERVICE_ON_042A
The same, as FHWA's code
SERVICE_UND_042B
What is under it: Waterway, Highway, Railroad, …
SERVICE_UND_042B
The same, as FHWA's code
STRUCTURE_KIND_043A
Main span material: Concrete, Steel, Prestressed concrete, … (continuous where spans are)
STRUCTURE_KIND_043A
The same, as FHWA's code
STRUCTURE_TYPE_043B
Main span design: Slab, Stringer/multi-beam or girder, Culvert, Truss, …
STRUCTURE_TYPE_043B
The same, as FHWA's code
APPR_KIND_044A
Approach span material, as main_material
APPR_KIND_044A
The same, as FHWA's code
APPR_TYPE_044B
Approach span design, as main_design
APPR_TYPE_044B
The same, as FHWA's code
MAIN_UNIT_SPANS_045
Number of main spans
APPR_SPANS_046
Number of approach spans
HORR_CLR_MT_047
Inventory route total horizontal clearance, meters
MAX_SPAN_LEN_MT_048
Length of the longest span, meters
STRUCTURE_LEN_MT_049
Structure length, meters
LEFT_CURB_MT_050A
Left curb or sidewalk width, meters
RIGHT_CURB_MT_050B
Right curb or sidewalk width, meters
ROADWAY_WIDTH_MT_051
Roadway width curb to curb, meters
DECK_WIDTH_MT_052
Deck width out to out, meters
VERT_CLR_OVER_MT_053
Minimum vertical clearance over the bridge deck, meters; 99.99 is no restriction
VERT_CLR_UND_REF_054A
What the underclearance is measured to: Highway, Railroad, Neither
VERT_CLR_UND_REF_054A
The same, as FHWA's code
VERT_CLR_UND_054B
Minimum vertical underclearance, meters
LAT_UND_REF_055A
What the lateral underclearance is measured to
LAT_UND_REF_055A
The same, as FHWA's code
LAT_UND_MT_055B
Minimum lateral underclearance on the right, meters
LEFT_LAT_UND_MT_056
Minimum lateral underclearance on the left, meters
DECK_COND_058
Deck condition rating, 0–9
SUPERSTRUCTURE_COND_059
Superstructure condition rating, 0–9
SUBSTRUCTURE_COND_060
Substructure condition rating, 0–9
CHANNEL_COND_061
Channel and channel protection rating, 0–9
CULVERT_COND_062
Culvert condition rating, 0–9
OPR_RATING_METH_063
Method of the operating rating
OPR_RATING_METH_063
The same, as FHWA's code
OPERATING_RATING_064
Operating rating: metric tons, or a rating factor where the method says so
INV_RATING_METH_065
Method of the inventory rating
INV_RATING_METH_065
The same, as FHWA's code
INVENTORY_RATING_066
Inventory rating, as operating_rating
STRUCTURAL_EVAL_067
Structural evaluation appraisal, 0–9
DECK_GEOMETRY_EVAL_068
Deck geometry appraisal, 0–9
UNDCLRENCE_EVAL_069
Underclearance appraisal, 0–9
POSTING_EVAL_070
Load posting appraisal, 0–5: 5 at or above legal loads, lower the further below
WATERWAY_EVAL_071
Waterway adequacy appraisal, 0–9
APPR_ROAD_EVAL_072
Approach roadway alignment appraisal, 0–9
WORK_PROPOSED_075A
Type of work proposed: replacement, widening, rehabilitation, …
WORK_PROPOSED_075A
The same, as FHWA's code
WORK_DONE_BY_075B
Contract or Owner's forces
WORK_DONE_BY_075B
The same, as FHWA's code
IMP_LEN_MT_076
Length of the proposed improvement, meters
DATE_OF_INSPECT_090
Month of the last routine inspection (its first day)
INSPECT_FREQ_MONTHS_091
Months between routine inspections
FRACTURE_092A
Fracture-critical inspection required
FRACTURE_092A
Its interval, months
UNDWATER_LOOK_SEE_092B
Underwater inspection required
UNDWATER_LOOK_SEE_092B
Its interval, months
SPEC_INSPECT_092C
Other special inspection required
SPEC_INSPECT_092C
Its interval, months
FRACTURE_LAST_DATE_093A
Month of the last fracture-critical inspection
UNDWATER_LAST_DATE_093B
Month of the last underwater inspection
SPEC_LAST_DATE_093C
Month of the last special inspection
BRIDGE_IMP_COST_094
Estimated cost of the bridge improvement, dollars
ROADWAY_IMP_COST_095
Estimated cost of the roadway improvement, dollars
TOTAL_IMP_COST_096
Estimated total project cost, dollars
YEAR_OF_IMP_097
Year of the cost estimate
OTHER_STATE_CODE_098A
Neighboring state's code (FIPS and region digit), CAN or MEX, for a border bridge
OTHER_STATE_PCNT_098B
Percent the neighboring state is responsible for
OTHR_STATE_STRUC_NO_099
The neighboring state's structure number
STRAHNET_HIGHWAY_100
Strategic Highway Network designation
STRAHNET_HIGHWAY_100
The same, as FHWA's code
PARALLEL_STRUCTURE_101
Left or right structure of a parallel pair, or none
PARALLEL_STRUCTURE_101
The same, as FHWA's code
TRAFFIC_DIRECTION_102
One-way, Two-way, One-lane bridge for two-way traffic, …
TRAFFIC_DIRECTION_102
The same, as FHWA's code
TEMP_STRUCTURE_103
A temporary structure
HIGHWAY_SYSTEM_104
On the National Highway System
FEDERAL_LANDS_105
Federal lands highway designation
FEDERAL_LANDS_105
The same, as FHWA's code
YEAR_RECONSTRUCTED_106
Year last reconstructed
DECK_STRUCTURE_TYPE_107
Deck structure type
DECK_STRUCTURE_TYPE_107
The same, as FHWA's code
SURFACE_TYPE_108A
Wearing surface
SURFACE_TYPE_108A
The same, as FHWA's code
MEMBRANE_TYPE_108B
Deck membrane
MEMBRANE_TYPE_108B
The same, as FHWA's code
DECK_PROTECTION_108C
Deck protection
DECK_PROTECTION_108C
The same, as FHWA's code
PERCENT_ADT_TRUCK_109
Trucks as a percent of average daily traffic
NATIONAL_NETWORK_110
On the national network for trucks
PIER_PROTECTION_111
Pier or abutment protection for navigation
PIER_PROTECTION_111
The same, as FHWA's code
BRIDGE_LEN_IND_112
Long enough to be an NBI bridge
SCOUR_CRITICAL_113
Scour status in words
SCOUR_CRITICAL_113
The same, as FHWA's code
FUTURE_ADT_114
Forecast average daily traffic
YEAR_OF_FUTURE_ADT_115
Year of the forecast
MIN_NAV_CLR_MT_116
Minimum navigation clearance of a lift bridge, meters
FED_AGENCY
Reported by a federal agency
SUBMITTED_BY
Who submitted the record: the state's FIPS code or a federal agency's owner code
BRIDGE_CONDITION
Good, Fair or Poor
BRIDGE_CONDITION
The same, as FHWA's code
LOWEST_RATING
Lowest of the deck, superstructure, substructure and culvert ratings
DECK_AREA
Deck area, square meters

More Massachusetts data

Every Massachusetts data set

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