US Bridges

ST 12 SB over HWY Neponset ST

Fair

Worcester County, Massachusetts · .1 Mi. W. of I-190 · Structure no. W441301KKDOTNBI

Built
1977
48 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
96 ft
1 main span
Daily traffic
6,625
2022 count
Owner
State
State Highway Agency

About this bridge

ST 12 SB over HWY Neponset ST is a prestressed concrete stringer/multi-beam or girder carrying ST 12 SB over HWY Neponset ST in Worcester County, Massachusetts. It was built in 1977, so it is 48 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 6,625 vehicles a day, roughly 12% of them trucks, projected to reach 19,267 by 2033. The structure is 96 ft (29.3 m) long and 33 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesST 12 SB
CrossesHWY Neponset ST
Location.1 Mi. W. of I-190
RouteState Highway 12
CountyWorcester County
StateMassachusetts
Coordinates42.29951, -71.80214
Functional classUrban Minor Arterial

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.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment6: Equal to present minimum criteria
Operating rating76.1 US tons
Inventory rating45.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length96 ft (29.3 m)
Longest span91 ft (27.7 m)
Deck width33 ft (10.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,625 (2022)
Projected traffic19,267 by 2033
Trucks12%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

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$3 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST 12 SB over HWY Neponset ST built?

It was built in 1977, making it 48 years old in 2025.

What condition is ST 12 SB over HWY Neponset ST 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 January 2024.

How much traffic does ST 12 SB over HWY Neponset ST carry?

About 6,625 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is ST 12 SB over HWY Neponset ST?

The structure is 96 ft (29.3 m) long with a longest span of 91 ft (27.7 m) and a deck 33 ft wide.

Who owns ST 12 SB over HWY Neponset ST?

It is owned by the State Highway Agency.