US Bridges

ST122 a over Water Blackstone River

Good

Worcester County, Massachusetts · .6 MI East of ST 146 · Structure no. M220055X3DOTNBI

Built
2011
14 years old
Condition
Good
inspected October 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
67 ft
1 main span
Daily traffic
6,600
2024 count
Owner
State
State Highway Agency

About this bridge

ST122 a over Water Blackstone River is a prestressed concrete box beam or girders - single or spread carrying ST122 a over Water Blackstone River in Worcester County, Massachusetts. It was built in 2011, so it is 14 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 6,600 vehicles a day, roughly 8% of them trucks. The structure is 67 ft (20.5 m) long and 48 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesST122 a
CrossesWater Blackstone River
Location.6 MI East of ST 146
RouteState Highway 122A
Coordinates42.19263, -71.75428
Functional classUrban Minor Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating82.5 US tons
Inventory rating56.1 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length67 ft (20.5 m)
Longest span64 ft (19.5 m)
Deck width48 ft (14.5 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,600 (2024)
Projected traffic—
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$1.7 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was ST122 a over Water Blackstone River built?

It was built in 2011, making it 14 years old in 2025.

What condition is ST122 a over Water Blackstone 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 October 2024.

How much traffic does ST122 a over Water Blackstone River carry?

About 6,600 vehicles per day (2024 count), of which roughly 8% are trucks.

How long is ST122 a over Water Blackstone River?

The structure is 67 ft (20.5 m) long with a longest span of 64 ft (19.5 m) and a deck 48 ft wide.

Who owns ST122 a over Water Blackstone River?

It is owned by the State Highway Agency.