US Bridges

ST 85 Washngton ST over Water Assabet River

Good

Middlesex County, Massachusetts · 0.25 MI South of ST 62 · Structure no. H25003BDTDOTNBI

Built
2017
8 years old
Condition
Good
inspected June 2024
Type
Tee Beam
Prestressed Concrete
Length
90 ft
1 main span
Daily traffic
10,800
2024 count
Owner
State
State Highway Agency

About this bridge

ST 85 Washngton ST over Water Assabet River is a prestressed concrete tee beam carrying ST 85 Washngton ST over Water Assabet River in Middlesex County, Massachusetts. It was built in 2017, so it is 8 years old, younger than the Massachusetts average of 63.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 10,800 vehicles a day, roughly 4% of them trucks. The structure is 90 ft (27.4 m) long and 58 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesST 85 Washngton ST
CrossesWater Assabet River
Location0.25 MI South of ST 62
RouteState Highway 85
Coordinates42.39046, -71.57024
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.7 US tons
Inventory rating46.4 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length90 ft (27.4 m)
Longest span85 ft (25.9 m)
Deck width58 ft (17.8 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,800 (2024)
Projected traffic—
Trucks4%
Lanes on structure2
Traffic directionTwo-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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was ST 85 Washngton ST over Water Assabet River built?

It was built in 2017, making it 8 years old in 2025.

What condition is ST 85 Washngton ST over Water Assabet River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2024.

How much traffic does ST 85 Washngton ST over Water Assabet River carry?

About 10,800 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is ST 85 Washngton ST over Water Assabet River?

The structure is 90 ft (27.4 m) long with a longest span of 85 ft (25.9 m) and a deck 58 ft wide.

Who owns ST 85 Washngton ST over Water Assabet River?

It is owned by the State Highway Agency.