US Bridges

Casper Street over Still River

Fair

Fairfield County, Connecticut · 200 Ft. West of Triangle · Structure no. 05101

Built
1974
51 years old
Condition
Fair
inspected March 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
148 ft
2 main spans
Daily traffic
1,320
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

Casper Street over Still River is a prestressed concrete box beam or girders - multiple carrying Casper Street over Still River in Fairfield County, Connecticut. It was built in 1974, so it is 51 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 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 1,320 vehicles a day, roughly 2% of them trucks, projected to reach 1,961 by 2044. The structure is 148 ft (45.1 m) long and 48 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesCasper Street
CrossesStill River
Location200 Ft. West of Triangle
RouteCity Street 0
Coordinates41.39345, -73.43925
Functional classUrban Local

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete
DeckOther
Main spans2
Design loadUnknown
Structure length148 ft (45.1 m)
Longest span71 ft (21.6 m)
Deck width48 ft (14.6 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,320 (2024)
Projected traffic1,961 by 2044
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Casper Street over Still River built?

It was built in 1974, making it 51 years old in 2025.

What condition is Casper Street 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 March 2024.

How much traffic does Casper Street over Still River carry?

About 1,320 vehicles per day (2024 count), of which roughly 2% are trucks.

How long is Casper Street over Still River?

The structure is 148 ft (45.1 m) long with a longest span of 71 ft (21.6 m) and a deck 48 ft wide.

Who owns Casper Street over Still River?

It is owned by the City or Municipal Highway Agency.