US Bridges

Plank Road over Mad River

Good

New Haven County, Connecticut · 100W of Harpers Ferry RD · Structure no. 05668

Built
2015
10 years old
Condition
Good
inspected December 2024
Type
Culvert
Concrete
Length
46 ft
3 main spans
Daily traffic
31,626
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

Plank Road over Mad River is a concrete culvert carrying Plank Road over Mad River in New Haven County, Connecticut. It was built in 2015, so it is 10 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 31,626 vehicles a day, roughly 2% of them trucks, projected to reach 46,993 by 2044. The structure is 46 ft (14 m) long and 46 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesPlank Road
CrossesMad River
Location100W of Harpers Ferry RD
RouteCity Street 0
Coordinates41.54069, -73.00889
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 inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating48.6 US tons
Inventory rating37.5 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHL 93
Structure length46 ft (14 m)
Longest span13 ft (4 m)
Deck width46 ft (13.9 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic31,626 (2024)
Projected traffic46,993 by 2044
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal 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 Plank Road over Mad River built?

It was built in 2015, making it 10 years old in 2025.

What condition is Plank Road over Mad 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 December 2024.

How much traffic does Plank Road over Mad River carry?

About 31,626 vehicles per day (2024 count), of which roughly 2% are trucks.

How long is Plank Road over Mad River?

The structure is 46 ft (14 m) long with a longest span of 13 ft (4 m) and a deck 46 ft wide.

Who owns Plank Road over Mad River?

It is owned by the City or Municipal Highway Agency.