US Bridges

HWY Benningtn ST over HWY Martin Coughlin by

Fair

Suffolk County, Massachusetts · 305 M S of Suffolk Downs · Structure no. B160713GYDOT634

Built
1906
119 years old, rebuilt 1982
Condition
Fair
inspected March 2024
Type
Girder and Floorbeam System
Steel
Length
63 ft
1 main span
Daily traffic
28,100
2024 count
Owner
State
State Highway Agency

About this bridge

HWY Benningtn ST over HWY Martin Coughlin by is a steel girder and floorbeam system carrying HWY Benningtn ST over HWY Martin Coughlin by in Suffolk County, Massachusetts. It was built in 1906 and reconstructed in 1982, so it is 119 years old, older than the Massachusetts average of 63.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 28,100 vehicles a day, roughly 4% of them trucks, projected to reach 57,329 by 2033. The structure is 63 ft (19.2 m) long and 152 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesHWY Benningtn ST
CrossesHWY Martin Coughlin by
Location305 M S of Suffolk Downs
RouteState Highway 145
Coordinates42.38006, -71.02541
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating60.3 US tons
Inventory rating38.7 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length63 ft (19.2 m)
Longest span60 ft (18.3 m)
Deck width152 ft (46.2 m)
Roadway width128 ft (38.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28,100 (2024)
Projected traffic57,329 by 2033
Trucks4%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$1.8 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was HWY Benningtn ST over HWY Martin Coughlin by built?

It was built in 1906, making it 119 years old in 2025. It was reconstructed in 1982.

What condition is HWY Benningtn ST over HWY Martin Coughlin by in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in March 2024.

How much traffic does HWY Benningtn ST over HWY Martin Coughlin by carry?

About 28,100 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is HWY Benningtn ST over HWY Martin Coughlin by?

The structure is 63 ft (19.2 m) long with a longest span of 60 ft (18.3 m) and a deck 152 ft wide.

Who owns HWY Benningtn ST over HWY Martin Coughlin by?

It is owned by the State Highway Agency.