US Bridges

ST 18 Broad ST over Water Town River

Fair

Plymouth County, Massachusetts · 4.5 M S of Whitman Tl · Structure no. B2300847WDOTNBI

Built
1926
99 years old
Condition
Fair
inspected April 2024
Type
Tee Beam
Concrete
Length
30 ft
1 main span
Daily traffic
19,200
2023 count
Owner
State
State Highway Agency

About this bridge

ST 18 Broad ST over Water Town River is a concrete tee beam carrying ST 18 Broad ST over Water Town River in Plymouth County, Massachusetts. It was built in 1926, so it is 99 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 19,200 vehicles a day, roughly 7% of them trucks, projected to reach 43,431 by 2032. The structure is 30 ft (9.1 m) long and 66 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesST 18 Broad ST
CrossesWater Town River
Location4.5 M S of Whitman Tl
RouteState Highway 18
CountyPlymouth County
StateMassachusetts
Coordinates41.99711, -70.97248
Functional classUrban Other Principal 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85.1 US tons
Inventory rating51.1 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length30 ft (9.1 m)
Longest span27 ft (8.2 m)
Deck width66 ft (20.1 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,200 (2023)
Projected traffic43,431 by 2032
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was ST 18 Broad ST over Water Town River built?

It was built in 1926, making it 99 years old in 2025.

What condition is ST 18 Broad ST over Water Town River 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 April 2024.

How much traffic does ST 18 Broad ST over Water Town River carry?

About 19,200 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is ST 18 Broad ST over Water Town River?

The structure is 30 ft (9.1 m) long with a longest span of 27 ft (8.2 m) and a deck 66 ft wide.

Who owns ST 18 Broad ST over Water Town River?

It is owned by the State Highway Agency.