US Bridges

Route 20 over Still River

Fair

Litchfield County, Connecticut · 1.1 MI from Winchester Tl · Structure no. 00874

Built
1953
72 years old
Condition
Fair
inspected September 2024
Type
Tee Beam
Concrete
Length
163 ft
4 main spans
Daily traffic
2,000
2021 count
Owner
State
State Highway Agency

About this bridge

Route 20 over Still River is a concrete tee beam carrying Route 20 over Still River in Litchfield County, Connecticut. It was built in 1953, so it is 72 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 2,000 vehicles a day, roughly 2% of them trucks, projected to reach 2,972 by 2041. The structure is 163 ft (49.7 m) long and 39 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesRoute 20
CrossesStill River
Location1.1 MI from Winchester Tl
RouteState Highway 20
Coordinates41.95987, -73.01983
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.
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
ScourScour critical; foundations unstable for calculated scour conditions
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 adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating40.7 US tons
Inventory rating31.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length163 ft (49.7 m)
Longest span41 ft (12.5 m)
Deck width39 ft (11.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,000 (2021)
Projected traffic2,972 by 2041
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed9.9 mi (16 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 20 over Still River built?

It was built in 1953, making it 72 years old in 2025.

What condition is Route 20 over Still 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 Route 20 over Still River carry?

About 2,000 vehicles per day (2021 count), of which roughly 2% are trucks.

How long is Route 20 over Still River?

The structure is 163 ft (49.7 m) long with a longest span of 41 ft (12.5 m) and a deck 39 ft wide.

Who owns Route 20 over Still River?

It is owned by the State Highway Agency.