US Bridges

HWY Beacon ST over Water Muddy River

Fair

Suffolk County, Massachusetts · .32 KM W of JCT BEACON&2A · Structure no. B16018397DOTNBI

Built
1900
125 years old, rebuilt 1982
Condition
Fair
inspected March 2024
Type
Slab
Prestressed Concrete
Length
54 ft
2 main spans
Daily traffic
8,300
2024 count
Owner
State
State Highway Agency

About this bridge

HWY Beacon ST over Water Muddy River is a prestressed concrete slab carrying HWY Beacon ST over Water Muddy River in Suffolk County, Massachusetts. It was built in 1900 and reconstructed in 1982, so it is 125 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 8,300 vehicles a day, roughly 13% of them trucks, projected to reach 38,693 by 2031. The structure is 54 ft (16.5 m) long and 71 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesHWY Beacon ST
CrossesWater Muddy River
Location.32 KM W of JCT BEACON&2A
Coordinates42.35006, -71.09247
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating81.8 US tons
Inventory rating47.8 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20 + Mod
Structure length54 ft (16.5 m)
Longest span27 ft (8.2 m)
Deck width71 ft (21.6 m)
Roadway width46 ft (14.1 m)
Vertical clearance over deck16 ft (4.9 m)

Traffic and service

Average daily traffic8,300 (2024)
Projected traffic38,693 by 2031
Trucks13%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesWaterway
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 statusPossibly eligible for the National Register; requires further investigation
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$3.6 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was HWY Beacon ST over Water Muddy River built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 1982.

What condition is HWY Beacon ST over Water Muddy 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 March 2024.

How much traffic does HWY Beacon ST over Water Muddy River carry?

About 8,300 vehicles per day (2024 count), of which roughly 13% are trucks.

How long is HWY Beacon ST over Water Muddy River?

The structure is 54 ft (16.5 m) long with a longest span of 27 ft (8.2 m) and a deck 71 ft wide.

Who owns HWY Beacon ST over Water Muddy River?

It is owned by the State Highway Agency.