US Bridges

ST117 Great RD over Water Assabet River

Fair

Middlesex County, Massachusetts · 0.4 Miles E Stow T. L. · Structure no. M1000228MDOTNBI

Built
1900
125 years old, rebuilt 1922
Condition
Fair
inspected September 2024
Type
Arch - Deck
Masonry
Length
60 ft
2 main spans
Daily traffic
11,163
2023 count
Owner
State
State Highway Agency

About this bridge

ST117 Great RD over Water Assabet River is a masonry arch - deck carrying ST117 Great RD over Water Assabet River in Middlesex County, Massachusetts. It was built in 1900 and reconstructed in 1922, so it is 125 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 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 11,163 vehicles a day, roughly 4% of them trucks, projected to reach 23,690 by 2031. The structure is 60 ft (18.3 m) long and 51 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesST117 Great RD
CrossesWater Assabet River
Location0.4 Miles E Stow T. L.
RouteState Highway 117
CountyMiddlesex County
StateMassachusetts
Coordinates42.42844, -71.46861
Functional classUrban Other Principal 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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating110.1 US tons
Inventory rating74.7 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckNot applicable
Main spans2
Design loadUnknown
Structure length60 ft (18.3 m)
Longest span27 ft (8.2 m)
Deck width51 ft (15.6 m)
Roadway width43 ft (13.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,163 (2023)
Projected traffic23,690 by 2031
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
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 statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.9 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was ST117 Great RD over Water Assabet River built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 1922.

What condition is ST117 Great RD over Water Assabet River 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 September 2024.

How much traffic does ST117 Great RD over Water Assabet River carry?

About 11,163 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is ST117 Great RD over Water Assabet River?

The structure is 60 ft (18.3 m) long with a longest span of 27 ft (8.2 m) and a deck 51 ft wide.

Who owns ST117 Great RD over Water Assabet River?

It is owned by the State Highway Agency.