US Bridges

US 6 Marion RD over Water Weweantic River

Poor

Plymouth County, Massachusetts · 2 MI E of RTE 105 · Structure no. W0601645KDOTNBI

Built
1929
96 years old, rebuilt 1957
Condition
Poor
inspected October 2024
Type
Tee Beam
Concrete Continuous
Length
148 ft
3 main spans
Daily traffic
8,214
2024 count
Owner
State
State Highway Agency

About this bridge

US 6 Marion RD over Water Weweantic River is a concrete continuous tee beam carrying US 6 Marion RD over Water Weweantic River in Plymouth County, Massachusetts. It was built in 1929 and reconstructed in 1957, so it is 96 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.

It carries about 8,214 vehicles a day, roughly 6% of them trucks, projected to reach 23,690 by 2031. The structure is 148 ft (45.2 m) long and 59 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesUS 6 Marion RD
CrossesWater Weweantic River
Location2 MI E of RTE 105
RouteU.S. Route 6
Coordinates41.73863, -70.74608
Functional classUrban Minor Arterial

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.6 US tons
Inventory rating26 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length148 ft (45.2 m)
Longest span52 ft (15.7 m)
Deck width59 ft (17.9 m)
Roadway width44 ft (13.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,214 (2024)
Projected traffic23,690 by 2031
Trucks6%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.8 mi (11 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$19.3 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 6 Marion RD over Water Weweantic River built?

It was built in 1929, making it 96 years old in 2025. It was reconstructed in 1957.

What condition is US 6 Marion RD over Water Weweantic River 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 October 2024.

How much traffic does US 6 Marion RD over Water Weweantic River carry?

About 8,214 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is US 6 Marion RD over Water Weweantic River?

The structure is 148 ft (45.2 m) long with a longest span of 52 ft (15.7 m) and a deck 59 ft wide.

Who owns US 6 Marion RD over Water Weweantic River?

It is owned by the State Highway Agency.