US Bridges

ST146 NB over HWY Mendon RD

Fair

Worcester County, Massachusetts · 0.7 MI Nth of Nrbridge Tl · Structure no. S330191MLDOTNBI

Built
1950
75 years old, rebuilt 1982
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
50 ft
1 main span
Daily traffic
15,800
2020 count
Owner
State
State Highway Agency

About this bridge

ST146 NB over HWY Mendon RD is a steel stringer/multi-beam or girder carrying ST146 NB over HWY Mendon RD in Worcester County, Massachusetts. It was built in 1950 and reconstructed in 1982, so it is 75 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 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 15,800 vehicles a day, roughly 8% of them trucks, projected to reach 252,688 by 2033. The structure is 50 ft (15.2 m) long and 47 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesST146 NB
CrossesHWY Mendon RD
Location0.7 MI Nth of Nrbridge Tl
RouteState Highway 146
CountyWorcester County
StateMassachusetts
Coordinates42.11486, -71.70509
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56 US tons
Inventory rating36.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length50 ft (15.2 m)
Longest span45 ft (13.7 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,800 (2020)
Projected traffic252,688 by 2033
Trucks8%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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$451,000 (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST146 NB over HWY Mendon RD built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1982.

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

About 15,800 vehicles per day (2020 count), of which roughly 8% are trucks.

How long is ST146 NB over HWY Mendon RD?

The structure is 50 ft (15.2 m) long with a longest span of 45 ft (13.7 m) and a deck 47 ft wide.

Who owns ST146 NB over HWY Mendon RD?

It is owned by the State Highway Agency.