US Bridges

HWY River ST over HWY Plimoth Plntn HWY

PoorClosed to traffic

Plymouth County, Massachusetts · 1.13 KM W of RTE 3A · Structure no. P130314B4DOTNBI

Built
1951
74 years old
Condition
Poor
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
182 ft
3 main spans
Daily traffic
5,200
2022 count
Owner
State
State Highway Agency

About this bridge

HWY River ST over HWY Plimoth Plntn HWY is a steel stringer/multi-beam or girder carrying HWY River ST over HWY Plimoth Plntn HWY in Plymouth County, Massachusetts. It was built in 1951, so it is 74 years old, older than the Massachusetts average of 63.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: closed to all traffic.

It carries about 5,200 vehicles a day, roughly 7% of them trucks, projected to reach 4,738 by 2031. The structure is 182 ft (55.5 m) long and 40 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesHWY River ST
CrossesHWY Plimoth Plntn HWY
Location1.13 KM W of RTE 3A
Coordinates41.93563, -70.62527
Functional classUrban Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 12 months
Operating statusClosed to all traffic
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment6: Equal to present minimum criteria
Operating rating49.9 US tons
Inventory rating27.1 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length182 ft (55.5 m)
Longest span70 ft (21.3 m)
Deck width40 ft (12.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,200 (2022)
Projected traffic4,738 by 2031
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed123.7 mi (199 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$14.1 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was HWY River ST over HWY Plimoth Plntn HWY built?

It was built in 1951, making it 74 years old in 2025.

What condition is HWY River ST over HWY Plimoth Plntn HWY in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2024.

How much traffic does HWY River ST over HWY Plimoth Plntn HWY carry?

About 5,200 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is HWY River ST over HWY Plimoth Plntn HWY?

The structure is 182 ft (55.5 m) long with a longest span of 70 ft (21.3 m) and a deck 40 ft wide.

Who owns HWY River ST over HWY Plimoth Plntn HWY?

It is owned by the State Highway Agency.