US Bridges

ST122 A/Main ST over Water Blackstone Canal

Fair

Worcester County, Massachusetts · .5 MI N of JCT ST-122 · Structure no. G080161YXDOTNBI

Built
1898
127 years old
Condition
Fair
inspected May 2024
Type
Arch - Deck
Masonry
Length
31 ft
1 main span
Daily traffic
4,452
2023 count
Owner
State
State Highway Agency

About this bridge

ST122 A/Main ST over Water Blackstone Canal is a masonry arch - deck carrying ST122 A/Main ST over Water Blackstone Canal in Worcester County, Massachusetts. It was built in 1898, so it is 127 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 4,452 vehicles a day, roughly 7% of them trucks, projected to reach 19,915 by 2031. The structure is 31 ft (9.6 m) long and 40 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesST122 A/Main ST
CrossesWater Blackstone Canal
Location.5 MI N of JCT ST-122
RouteState Highway 122A
CountyWorcester County
StateMassachusetts
Coordinates42.17733, -71.69018
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
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating110 US tons
Inventory rating109.9 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckNot applicable
Main spans1
Design loadUnknown
Structure length31 ft (9.6 m)
Longest span31 ft (9.6 m)
Deck width40 ft (12.2 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,452 (2023)
Projected traffic19,915 by 2031
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

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$842,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was ST122 A/Main ST over Water Blackstone Canal built?

It was built in 1898, making it 127 years old in 2025.

What condition is ST122 A/Main ST over Water Blackstone Canal 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 May 2024.

How much traffic does ST122 A/Main ST over Water Blackstone Canal carry?

About 4,452 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is ST122 A/Main ST over Water Blackstone Canal?

The structure is 31 ft (9.6 m) long with a longest span of 31 ft (9.6 m) and a deck 40 ft wide.

Who owns ST122 A/Main ST over Water Blackstone Canal?

It is owned by the State Highway Agency.