US Bridges

Mansion Road over Mill River

Good

New Haven County, Connecticut · 175 Ft E of Route 10 · Structure no. 07021

Built
1999
26 years old
Condition
Good
inspected May 2023
Type
Culvert
Concrete
Length
22 ft
2 main spans
Daily traffic
306
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Mansion Road over Mill River is a concrete culvert carrying Mansion Road over Mill River in New Haven County, Connecticut. It was built in 1999, so it is 26 years old, younger 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 306 vehicles a day, roughly 10% of them trucks, projected to reach 455 by 2043. The structure is 22 ft (6.7 m) long and 63 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesMansion Road
CrossesMill River
Location175 Ft E of Route 10
RouteCity Street 0
Coordinates41.47861, -72.905
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 inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.1 US tons
Inventory rating31.4 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckOther
Main spans2
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width63 ft (19.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic306 (2023)
Projected traffic455 by 2043
Trucks10%
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 byCity or Municipal 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 Mansion Road over Mill River built?

It was built in 1999, making it 26 years old in 2025.

What condition is Mansion Road over Mill 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 May 2023.

How much traffic does Mansion Road over Mill River carry?

About 306 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Mansion Road over Mill River?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m) and a deck 63 ft wide.

Who owns Mansion Road over Mill River?

It is owned by the Town or Township Highway Agency and maintained by the City or Municipal Highway Agency.