US Bridges

ST146 SB over Water Mumford River

Fair

Worcester County, Massachusetts · .7MI. S. of Lackey Dam RD · Structure no. U020601N7DOTNBI

Built
1983
42 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
96 ft
1 main span
Daily traffic
19,123
2023 count
Owner
State
State Highway Agency

About this bridge

ST146 SB over Water Mumford River is a prestressed concrete stringer/multi-beam or girder carrying ST146 SB over Water Mumford River in Worcester County, Massachusetts. It was built in 1983, so it is 42 years old, younger 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 19,123 vehicles a day, roughly 23% of them trucks, projected to reach 30,007 by 2033. The structure is 96 ft (29.2 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesST146 SB
CrossesWater Mumford River
Location.7MI. S. of Lackey Dam RD
RouteState Highway 146
CountyWorcester County
StateMassachusetts
Coordinates42.08268, -71.69001
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 protection7 GoodSome minor problems.
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 geometry8: Equal to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80 US tons
Inventory rating47.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length96 ft (29.2 m)
Longest span91 ft (27.7 m)
Deck width45 ft (13.8 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,123 (2023)
Projected traffic30,007 by 2033
Trucks23%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
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 statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$4 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST146 SB over Water Mumford River built?

It was built in 1983, making it 42 years old in 2025.

What condition is ST146 SB over Water Mumford 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 ST146 SB over Water Mumford River carry?

About 19,123 vehicles per day (2023 count), of which roughly 23% are trucks.

How long is ST146 SB over Water Mumford River?

The structure is 96 ft (29.2 m) long with a longest span of 91 ft (27.7 m) and a deck 45 ft wide.

Who owns ST146 SB over Water Mumford River?

It is owned by the State Highway Agency.