US Bridges

ST117 Great RD over Water Mill Canal

Fair

Middlesex County, Massachusetts · Inter of Winter& RT117 · Structure no. M100097PRMUNNBI

Built
1850
175 years old
Condition
Fair
inspected March 2025
Type
Arch - Deck
Masonry
Length
33 ft
2 main spans
Daily traffic
11,163
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

ST117 Great RD over Water Mill Canal is a masonry arch - deck carrying ST117 Great RD over Water Mill Canal in Middlesex County, Massachusetts. It was built in 1850, so it is 175 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 11,163 vehicles a day, roughly 4% of them trucks. The structure is 33 ft (10.1 m) long and 80 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesST117 Great RD
CrossesWater Mill Canal
LocationInter of Winter& RT117
RouteState Highway 117
CountyMiddlesex County
StateMassachusetts
Coordinates42.42768, -71.46456
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum 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 rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckNot applicable
Main spans2
Design loadHS 20
Structure length33 ft (10.1 m)
Longest span9 ft (2.8 m)
Deck width80 ft (24.4 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,163 (2023)
Projected traffic—
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRelief for waterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$875,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was ST117 Great RD over Water Mill Canal built?

It was built in 1850, making it 175 years old in 2025.

What condition is ST117 Great RD over Water Mill 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 March 2025.

How much traffic does ST117 Great RD over Water Mill Canal carry?

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

How long is ST117 Great RD over Water Mill Canal?

The structure is 33 ft (10.1 m) long with a longest span of 9 ft (2.8 m) and a deck 80 ft wide.

Who owns ST117 Great RD over Water Mill Canal?

It is owned by the Town or Township Highway Agency.