US Bridges

Route 40 NB over Route 22 & Mill River

Fair

New Haven County, Connecticut · 0.3 Mile S. of Route 10 · Structure no. 03832

Built
1976
49 years old
Condition
Fair
inspected January 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
246 ft
2 main spans
Daily traffic
11,300
2019 count
Owner
State
State Highway Agency

About this bridge

Route 40 NB over Route 22 & Mill River is a steel continuous stringer/multi-beam or girder carrying Route 40 NB over Route 22 & Mill River in New Haven County, Connecticut. It was built in 1976, so it is 49 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 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 11,300 vehicles a day, roughly 6% of them trucks, projected to reach 16,791 by 2039. The structure is 246 ft (75 m) long and 46 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesRoute 40 NB
CrossesRoute 22 & Mill River
Location0.3 Mile S. of Route 10
RouteState Highway 40
CountyNew Haven County
StateConnecticut
Coordinates41.39901, -72.89248
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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31.7 US tons
Inventory rating24.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length246 ft (75 m)
Longest span120 ft (36.6 m)
Deck width46 ft (14 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,300 (2019)
Projected traffic16,791 by 2039
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed1.2 mi (2 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 40 NB over Route 22 & Mill River built?

It was built in 1976, making it 49 years old in 2025.

What condition is Route 40 NB over Route 22 & Mill 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 January 2023.

How much traffic does Route 40 NB over Route 22 & Mill River carry?

About 11,300 vehicles per day (2019 count), of which roughly 6% are trucks.

How long is Route 40 NB over Route 22 & Mill River?

The structure is 246 ft (75 m) long with a longest span of 120 ft (36.6 m) and a deck 46 ft wide.

Who owns Route 40 NB over Route 22 & Mill River?

It is owned by the State Highway Agency.