US Bridges

I-91 N.B. Ramps over Willow Brook

Fair

New Haven County, Connecticut · I-91 N.B. Exit No. 16 · Structure no. 01820

Built
1964
61 years old
Condition
Fair
inspected November 2024
Type
Culvert
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
5,700
2022 count
Owner
State
State Highway Agency

About this bridge

I-91 N.B. Ramps over Willow Brook is a concrete continuous culvert carrying I-91 N.B. Ramps over Willow Brook in New Haven County, Connecticut. It was built in 1964, so it is 61 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 5,700 vehicles a day, roughly 9% of them trucks, projected to reach 8,470 by 2042. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-91 N.B. Ramps
CrossesWillow Brook
LocationI-91 N.B. Exit No. 16
RouteInterstate 91
CountyNew Haven County
StateConnecticut
Coordinates41.52532, -72.76819
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating85.3 US tons
Inventory rating65.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,700 (2022)
Projected traffic8,470 by 2042
Trucks9%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-91 N.B. Ramps over Willow Brook built?

It was built in 1964, making it 61 years old in 2025.

What condition is I-91 N.B. Ramps over Willow Brook 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 November 2024.

How much traffic does I-91 N.B. Ramps over Willow Brook carry?

About 5,700 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is I-91 N.B. Ramps over Willow Brook?

The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.7 m).

Who owns I-91 N.B. Ramps over Willow Brook?

It is owned by the State Highway Agency.