US Bridges

SR 660 over Shetucket River

Fair

New London County, Connecticut · 05 MI North of Route 97 · Structure no. 01642

Built
1939
86 years old, rebuilt 1988
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
324 ft
4 main spans
Daily traffic
2,600
2020 count
Owner
State
State Highway Agency

About this bridge

SR 660 over Shetucket River is a steel continuous stringer/multi-beam or girder carrying SR 660 over Shetucket River in New London County, Connecticut. It was built in 1939 and reconstructed in 1988, so it is 86 years old, older than the Connecticut average of 56.7 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 2,600 vehicles a day, roughly 5% of them trucks, projected to reach 3,863 by 2040. The structure is 324 ft (98.8 m) long and 34 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSR 660
CrossesShetucket River
Location05 MI North of Route 97
RouteState Highway 660
CountyNew London County
StateConnecticut
Coordinates41.59658, -72.04921
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating49.6 US tons
Inventory rating38.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length324 ft (98.8 m)
Longest span80 ft (24.4 m)
Deck width34 ft (10.4 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,600 (2020)
Projected traffic3,863 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 660 over Shetucket River built?

It was built in 1939, making it 86 years old in 2025. It was reconstructed in 1988.

What condition is SR 660 over Shetucket 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 April 2023.

How much traffic does SR 660 over Shetucket River carry?

About 2,600 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is SR 660 over Shetucket River?

The structure is 324 ft (98.8 m) long with a longest span of 80 ft (24.4 m) and a deck 34 ft wide.

Who owns SR 660 over Shetucket River?

It is owned by the State Highway Agency.