US Bridges

Prospect Street over W Branch Naugatuck River

Fair

Litchfield County, Connecticut · 500 Ft So of Water Street · Structure no. 05550

Built
1912
113 years old, rebuilt 1988
Condition
Fair
inspected July 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
87 ft
1 main span
Daily traffic
3,090
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

Prospect Street over W Branch Naugatuck River is a prestressed concrete box beam or girders - multiple carrying Prospect Street over W Branch Naugatuck River in Litchfield County, Connecticut. It was built in 1912 and reconstructed in 1988, so it is 113 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 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 3,090 vehicles a day, roughly 2% of them trucks, projected to reach 4,591 by 2044. The structure is 87 ft (26.5 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesProspect Street
CrossesW Branch Naugatuck River
Location500 Ft So of Water Street
RouteCity Street 0
Coordinates41.8007, -73.12336
Functional classUrban 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 alignment8: Equal to present desirable criteria
Operating rating105.9 US tons
Inventory rating61 US tons

Structure

MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length87 ft (26.5 m)
Longest span81 ft (24.8 m)
Deck width41 ft (12.6 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,090 (2024)
Projected traffic4,591 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 Prospect Street over W Branch Naugatuck River built?

It was built in 1912, making it 113 years old in 2025. It was reconstructed in 1988.

What condition is Prospect Street over W Branch Naugatuck 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 July 2024.

How much traffic does Prospect Street over W Branch Naugatuck River carry?

About 3,090 vehicles per day (2024 count), of which roughly 2% are trucks.

How long is Prospect Street over W Branch Naugatuck River?

The structure is 87 ft (26.5 m) long with a longest span of 81 ft (24.8 m) and a deck 41 ft wide.

Who owns Prospect Street over W Branch Naugatuck River?

It is owned by the City or Municipal Highway Agency.