US Bridges

Route 15 over Mianus River

FairPosted for load

Fairfield County, Connecticut · 0.6 MI E Stamford T/L · Structure no. 00701

Built
1937
88 years old
Condition
Fair
inspected July 2024
Type
Culvert
Concrete Continuous
Length
28 ft
2 main spans
Daily traffic
65,120
2019 count
Owner
State
State Highway Agency

About this bridge

Route 15 over Mianus River is a concrete continuous culvert carrying Route 15 over Mianus River in Fairfield County, Connecticut. It was built in 1937, so it is 88 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. Its operating status is: posted for other load-capacity restriction.

It carries about 65,120 vehicles a day, roughly 1% of them trucks, projected to reach 96,762 by 2039. The structure is 28 ft (8.5 m) long. If it were closed, the detour would be 3.1 mi (5 km).

CarriesRoute 15
CrossesMianus River
Location0.6 MI E Stamford T/L
RouteState Highway 15
Coordinates41.10067, -73.58876
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length28 ft (8.5 m)
Longest span13 ft (4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic65,120 (2019)
Projected traffic96,762 by 2039
Trucks1%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Route 15 over Mianus River built?

It was built in 1937, making it 88 years old in 2025.

What condition is Route 15 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 July 2024.

How much traffic does Route 15 over Mianus River carry?

About 65,120 vehicles per day (2019 count), of which roughly 1% are trucks.

How long is Route 15 over Mianus River?

The structure is 28 ft (8.5 m) long with a longest span of 13 ft (4 m).

Who owns Route 15 over Mianus River?

It is owned by the State Highway Agency.