US Bridges

Valley Road over Mianus River

Fair

Fairfield County, Connecticut · O/ Mianus River · Structure no. 03959

Built
1929
96 years old, rebuilt 2004
Condition
Fair
inspected April 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
67 ft
1 main span
Daily traffic
1,920
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Valley Road over Mianus River is a prestressed concrete box beam or girders - multiple carrying Valley Road over Mianus River in Fairfield County, Connecticut. It was built in 1929 and reconstructed in 2004, so it is 96 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 1,920 vehicles a day, roughly 5% of them trucks, projected to reach 2,853 by 2043. The structure is 67 ft (20.4 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesValley Road
CrossesMianus River
LocationO/ Mianus River
RouteCity Street 0
Coordinates41.07068, -73.57813
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating80.5 US tons
Inventory rating48.3 US tons

Structure

MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length67 ft (20.4 m)
Longest span65 ft (19.8 m)
Deck width31 ft (9.6 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,920 (2023)
Projected traffic2,853 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Valley Road over Mianus River built?

It was built in 1929, making it 96 years old in 2025. It was reconstructed in 2004.

What condition is Valley Road over Mianus 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 April 2023.

How much traffic does Valley Road over Mianus River carry?

About 1,920 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Valley Road over Mianus River?

The structure is 67 ft (20.4 m) long with a longest span of 65 ft (19.8 m) and a deck 31 ft wide.

Who owns Valley Road over Mianus River?

It is owned by the Town or Township Highway Agency.