US Bridges

ST177 Amer Lgn HWY over Water E Br Westport Riv

Fair

Bristol County, Massachusetts · .3 MI SW of US 6 · Structure no. W300143W4DOTNBI

Built
1941
84 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
60 ft
1 main span
Daily traffic
4,981
2022 count
Owner
State
State Highway Agency

About this bridge

ST177 Amer Lgn HWY over Water E Br Westport Riv is a steel stringer/multi-beam or girder carrying ST177 Amer Lgn HWY over Water E Br Westport Riv in Bristol County, Massachusetts. It was built in 1941, so it is 84 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 5 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 4,981 vehicles a day, roughly 6% of them trucks, projected to reach 19,741 by 2033. The structure is 60 ft (18.3 m) long and 45 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesST177 Amer Lgn HWY
CrossesWater E Br Westport Riv
Location.3 MI SW of US 6
RouteState Highway 177
CountyBristol County
StateMassachusetts
Coordinates41.63618, -71.04945
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating26 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length60 ft (18.3 m)
Longest span57 ft (17.4 m)
Deck width45 ft (13.6 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,981 (2022)
Projected traffic19,741 by 2033
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.5 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was ST177 Amer Lgn HWY over Water E Br Westport Riv built?

It was built in 1941, making it 84 years old in 2025.

What condition is ST177 Amer Lgn HWY over Water E Br Westport Riv 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 ST177 Amer Lgn HWY over Water E Br Westport Riv carry?

About 4,981 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is ST177 Amer Lgn HWY over Water E Br Westport Riv?

The structure is 60 ft (18.3 m) long with a longest span of 57 ft (17.4 m) and a deck 45 ft wide.

Who owns ST177 Amer Lgn HWY over Water E Br Westport Riv?

It is owned by the State Highway Agency.