US Bridges

ST146 SB over HWY Mendon RD

Fair

Worcester County, Massachusetts · .7MI. N. of Nrthbrdg T.L. · Structure no. S330231MPDOTNBI

Built
1982
43 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
90 ft
1 main span
Daily traffic
19,851
2022 count
Owner
State
State Highway Agency

About this bridge

ST146 SB over HWY Mendon RD is a steel stringer/multi-beam or girder carrying ST146 SB over HWY Mendon RD in Worcester County, Massachusetts. It was built in 1982, so it is 43 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 6 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 19,851 vehicles a day, roughly 9% of them trucks, projected to reach 25,269 by 2033. The structure is 90 ft (27.4 m) long and 45 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesST146 SB
CrossesHWY Mendon RD
Location.7MI. N. of Nrthbrdg T.L.
RouteState Highway 146
CountyWorcester County
StateMassachusetts
Coordinates42.11497, -71.70571
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70.1 US tons
Inventory rating42 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length90 ft (27.4 m)
Longest span84 ft (25.6 m)
Deck width45 ft (13.7 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deck18 ft (5.6 m)

Traffic and service

Average daily traffic19,851 (2022)
Projected traffic25,269 by 2033
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$749,000 (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST146 SB over HWY Mendon RD built?

It was built in 1982, making it 43 years old in 2025.

What condition is ST146 SB over HWY Mendon RD 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 HWY Mendon RD carry?

About 19,851 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is ST146 SB over HWY Mendon RD?

The structure is 90 ft (27.4 m) long with a longest span of 84 ft (25.6 m) and a deck 45 ft wide.

Who owns ST146 SB over HWY Mendon RD?

It is owned by the State Highway Agency.