US Bridges

ST 3 Nb/Plgrm HWY over HWY Plimoth Plntn HWY

Fair

Plymouth County, Massachusetts · .8 MI So of Long Pond RD · Structure no. P13033497DOTNBI

Built
1956
69 years old, rebuilt 1978
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
117 ft
1 main span
Daily traffic
20,865
2022 count
Owner
State
State Highway Agency

About this bridge

ST 3 Nb/Plgrm HWY over HWY Plimoth Plntn HWY is a steel stringer/multi-beam or girder carrying ST 3 Nb/Plgrm HWY over HWY Plimoth Plntn HWY in Plymouth County, Massachusetts. It was built in 1956 and reconstructed in 1978, so it is 69 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 20,865 vehicles a day, roughly 5% of them trucks, projected to reach 61,909 by 2033. The structure is 117 ft (35.7 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesST 3 Nb/Plgrm HWY
CrossesHWY Plimoth Plntn HWY
Location.8 MI So of Long Pond RD
RouteState Highway 3
CountyPlymouth County
StateMassachusetts
Coordinates41.93222, -70.64196
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.6 US tons
Inventory rating24.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length117 ft (35.7 m)
Longest span107 ft (32.6 m)
Deck width42 ft (12.8 m)
Roadway width39 ft (11.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,865 (2022)
Projected traffic61,909 by 2033
Trucks5%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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$4.5 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST 3 Nb/Plgrm HWY over HWY Plimoth Plntn HWY built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 1978.

What condition is ST 3 Nb/Plgrm HWY over HWY Plimoth Plntn HWY 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 January 2024.

How much traffic does ST 3 Nb/Plgrm HWY over HWY Plimoth Plntn HWY carry?

About 20,865 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is ST 3 Nb/Plgrm HWY over HWY Plimoth Plntn HWY?

The structure is 117 ft (35.7 m) long with a longest span of 107 ft (32.6 m) and a deck 42 ft wide.

Who owns ST 3 Nb/Plgrm HWY over HWY Plimoth Plntn HWY?

It is owned by the State Highway Agency.