US Bridges

Route 317 over Pomperaug River

Fair

Litchfield County, Connecticut · 1.4 Miles West of Route 6 · Structure no. 05716

Built
1989
36 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
201 ft
3 main spans
Daily traffic
6,000
2023 count
Owner
State
State Highway Agency

About this bridge

Route 317 over Pomperaug River is a steel continuous stringer/multi-beam or girder carrying Route 317 over Pomperaug River in Litchfield County, Connecticut. It was built in 1989, so it is 36 years old, younger 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 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 6,000 vehicles a day, roughly 3% of them trucks, projected to reach 8,915 by 2043. The structure is 201 ft (61.3 m) long and 36 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesRoute 317
CrossesPomperaug River
Location1.4 Miles West of Route 6
RouteState Highway 317
Coordinates41.54044, -73.2136
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating59.6 US tons
Inventory rating46.1 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length201 ft (61.3 m)
Longest span76 ft (23.2 m)
Deck width36 ft (10.9 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,000 (2023)
Projected traffic8,915 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Route 317 over Pomperaug River built?

It was built in 1989, making it 36 years old in 2025.

What condition is Route 317 over Pomperaug 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 August 2024.

How much traffic does Route 317 over Pomperaug River carry?

About 6,000 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Route 317 over Pomperaug River?

The structure is 201 ft (61.3 m) long with a longest span of 76 ft (23.2 m) and a deck 36 ft wide.

Who owns Route 317 over Pomperaug River?

It is owned by the State Highway Agency.