US Bridges

HWY Cox ST over Water Assabet River

FairPosted for load

Middlesex County, Massachusetts · .5 MI NW of RTE 62 · Structure no. H2500824LMUNNBI

Built
1928
97 years old, rebuilt 1980
Condition
Fair
inspected March 2024
Type
Tee Beam
Concrete Continuous
Length
56 ft
2 main spans
Daily traffic
6,500
2024 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

HWY Cox ST over Water Assabet River is a concrete continuous tee beam carrying HWY Cox ST over Water Assabet River in Middlesex County, Massachusetts. It was built in 1928 and reconstructed in 1980, so it is 97 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. Its operating status is: posted for load restriction.

It carries about 6,500 vehicles a day, roughly 6% of them trucks, projected to reach 13,108 by 2033. The structure is 56 ft (17.1 m) long and 32 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesHWY Cox ST
CrossesWater Assabet River
Location.5 MI NW of RTE 62
RouteCity Street 0
Coordinates42.39976, -71.54597
Functional classUrban Collector

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 protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating35.5 US tons
Inventory rating21.3 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length56 ft (17.1 m)
Longest span26 ft (7.9 m)
Deck width32 ft (9.8 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,500 (2024)
Projected traffic13,108 by 2033
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township 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$1.7 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was HWY Cox ST over Water Assabet River built?

It was built in 1928, making it 97 years old in 2025. It was reconstructed in 1980.

What condition is HWY Cox ST over Water Assabet 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 Cox ST over Water Assabet River carry?

About 6,500 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is HWY Cox ST over Water Assabet River?

The structure is 56 ft (17.1 m) long with a longest span of 26 ft (7.9 m) and a deck 32 ft wide.

Who owns HWY Cox ST over Water Assabet River?

It is owned by the Town or Township Highway Agency.