US Bridges

Frost Road over Mad River

Fair

New Haven County, Connecticut · 0.2 Mile East of Route 69 · Structure no. 04163

Built
1965
60 years old
Condition
Fair
inspected October 2024
Type
Culvert
Concrete Continuous
Length
53 ft
3 main spans
Daily traffic
11,000
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Frost Road over Mad River is a concrete continuous culvert carrying Frost Road over Mad 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 4% of them trucks, projected to reach 16,345 by 2040. The structure is 53 ft (16.2 m) long and 63 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesFrost Road
CrossesMad River
Location0.2 Mile East of Route 69
RouteCity Street 0
Coordinates41.55996, -73.00301
Functional classUrban Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 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 alignment6: Equal to present minimum criteria
Operating rating37.8 US tons
Inventory rating29.3 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length53 ft (16.2 m)
Longest span16 ft (4.9 m)
Deck width63 ft (19.3 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,000 (2020)
Projected traffic16,345 by 2040
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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 Frost Road over Mad River built?

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

What condition is Frost Road over Mad 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 October 2024.

How much traffic does Frost Road over Mad River carry?

About 11,000 vehicles per day (2020 count), of which roughly 4% are trucks.

How long is Frost Road over Mad River?

The structure is 53 ft (16.2 m) long with a longest span of 16 ft (4.9 m) and a deck 63 ft wide.

Who owns Frost Road over Mad River?

It is owned by the City or Municipal Highway Agency.