US Bridges

Route 15 SB over Quinnipiac River

FairPosted for load

New Haven County, Connecticut · 1 Mi. No. of JCT RTE 150 · Structure no. 00793B

Built
1946
79 years old, rebuilt 1990
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
107 ft
2 main spans
Daily traffic
35,800
2019 count
Owner
State
State Highway Agency

About this bridge

Route 15 SB over Quinnipiac River is a steel stringer/multi-beam or girder carrying Route 15 SB over Quinnipiac River in New Haven County, Connecticut. It was built in 1946 and reconstructed in 1990, so it is 79 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. Its operating status is: posted for other load-capacity restriction.

It carries about 35,800 vehicles a day, roughly 1% of them trucks, projected to reach 53,195 by 2039. The structure is 107 ft (32.6 m) long and 37 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesRoute 15 SB
CrossesQuinnipiac River
Location1 Mi. No. of JCT RTE 150
RouteState Highway 15
CountyNew Haven County
StateConnecticut
Coordinates41.47527, -72.8256
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85.8 US tons
Inventory rating66 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length107 ft (32.6 m)
Longest span51 ft (15.5 m)
Deck width37 ft (11.2 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35,800 (2019)
Projected traffic53,195 by 2039
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

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 15 SB over Quinnipiac River built?

It was built in 1946, making it 79 years old in 2025. It was reconstructed in 1990.

What condition is Route 15 SB over Quinnipiac 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 October 2024.

How much traffic does Route 15 SB over Quinnipiac River carry?

About 35,800 vehicles per day (2019 count), of which roughly 1% are trucks.

How long is Route 15 SB over Quinnipiac River?

The structure is 107 ft (32.6 m) long with a longest span of 51 ft (15.5 m) and a deck 37 ft wide.

Who owns Route 15 SB over Quinnipiac River?

It is owned by the State Highway Agency.