US Bridges

Derby Milford Road over Route 15

Fair

New Haven County, Connecticut · 3.7 MI N. of Route 110 · Structure no. 00764

Built
1941
84 years old, rebuilt 1990
Condition
Fair
inspected October 2023
Type
Frame
Steel Continuous
Length
141 ft
2 main spans
Daily traffic
7,600
2021 count
Owner
State
State Highway Agency

About this bridge

Derby Milford Road over Route 15 is a steel continuous frame carrying Derby Milford Road over Route 15 in New Haven County, Connecticut. It was built in 1941 and reconstructed in 1990, so it is 84 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 7,600 vehicles a day, roughly 4% of them trucks, projected to reach 11,293 by 2041. The structure is 141 ft (43 m) long and 35 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesDerby Milford Road
CrossesRoute 15
Location3.7 MI N. of Route 110
RouteCity Street 0
CountyNew Haven County
StateConnecticut
Coordinates41.27669, -73.05112
Functional classUrban Minor Arterial

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.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment6: Equal to present minimum criteria
Operating rating57.9 US tons
Inventory rating44.6 US tons

Structure

Structure typeFrame
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length141 ft (43 m)
Longest span64 ft (19.5 m)
Deck width35 ft (10.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,600 (2021)
Projected traffic11,293 by 2041
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Derby Milford Road over Route 15 built?

It was built in 1941, making it 84 years old in 2025. It was reconstructed in 1990.

What condition is Derby Milford Road over Route 15 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 2023.

How much traffic does Derby Milford Road over Route 15 carry?

About 7,600 vehicles per day (2021 count), of which roughly 4% are trucks.

How long is Derby Milford Road over Route 15?

The structure is 141 ft (43 m) long with a longest span of 64 ft (19.5 m) and a deck 35 ft wide.

Who owns Derby Milford Road over Route 15?

It is owned by the State Highway Agency.