US Bridges

Mill Street over Quinnipiac River

Good

Hartford County, Connecticut · 0.2 MI W of Route 10 · Structure no. 04559

Built
1955
70 years old
Condition
Good
inspected October 2024
Type
Culvert
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
3,225
2024 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Mill Street over Quinnipiac River is a concrete continuous culvert carrying Mill Street over Quinnipiac River in Hartford County, Connecticut. It was built in 1955, so it is 70 years old, older than the Connecticut average of 56.7 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,225 vehicles a day, roughly 2% of them trucks, projected to reach 4,792 by 2044. The structure is 25 ft (7.6 m) long and 33 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesMill Street
CrossesQuinnipiac River
Location0.2 MI W of Route 10
RouteCity Street 0
Coordinates41.60436, -72.88258
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating42.5 US tons
Inventory rating32.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckOther
Main spans2
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span12 ft (3.7 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,225 (2024)
Projected traffic4,792 by 2044
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township 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 Mill Street over Quinnipiac River built?

It was built in 1955, making it 70 years old in 2025.

What condition is Mill Street over Quinnipiac River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2024.

How much traffic does Mill Street over Quinnipiac River carry?

About 3,225 vehicles per day (2024 count), of which roughly 2% are trucks.

How long is Mill Street over Quinnipiac River?

The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.7 m) and a deck 33 ft wide.

Who owns Mill Street over Quinnipiac River?

It is owned by the Town or Township Highway Agency.