US Bridges

I-91 NB Ramp 138 over Mill River

Fair

New Haven County, Connecticut · I-91 NB Exit No. 5 · Structure no. 03014B

Built
1965
60 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
152 ft
2 main spans
Daily traffic
11,000
2022 count
Owner
State
State Highway Agency

About this bridge

I-91 NB Ramp 138 over Mill River is a steel stringer/multi-beam or girder carrying I-91 NB Ramp 138 over Mill River in New Haven County, Connecticut. It was built in 1965, so it is 60 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 11,000 vehicles a day, roughly 5% of them trucks, projected to reach 16,345 by 2042. The structure is 152 ft (46.3 m) long and 31 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-91 NB Ramp 138
CrossesMill River
LocationI-91 NB Exit No. 5
RouteInterstate 91
CountyNew Haven County
StateConnecticut
Coordinates41.31565, -72.90617
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating64.6 US tons
Inventory rating50 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length152 ft (46.3 m)
Longest span78 ft (23.7 m)
Deck width31 ft (9.6 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,000 (2022)
Projected traffic16,345 by 2042
Trucks5%
Lanes on structure1
Traffic directionOne-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 NB Ramp 138 over Mill River built?

It was built in 1965, making it 60 years old in 2025.

What condition is I-91 NB Ramp 138 over 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 2024.

How much traffic does I-91 NB Ramp 138 over Mill River carry?

About 11,000 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is I-91 NB Ramp 138 over Mill River?

The structure is 152 ft (46.3 m) long with a longest span of 78 ft (23.7 m) and a deck 31 ft wide.

Who owns I-91 NB Ramp 138 over Mill River?

It is owned by the State Highway Agency.