US Bridges

Old Rock Lane over Five Mile River

Fair

Fairfield County, Connecticut · 0.2 MI E of W. Norwalk RD · Structure no. 05540

Built
1987
38 years old
Condition
Fair
inspected July 2024
Type
Slab
Prestressed Concrete
Length
35 ft
1 main span
Daily traffic
938
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

Old Rock Lane over Five Mile River is a prestressed concrete slab carrying Old Rock Lane over Five Mile River in Fairfield County, Connecticut. It was built in 1987, so it is 38 years old, younger 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 5 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 938 vehicles a day, roughly 2% of them trucks, projected to reach 1,394 by 2044. The structure is 35 ft (10.7 m) long and 33 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesOld Rock Lane
CrossesFive Mile River
Location0.2 MI E of W. Norwalk RD
RouteCity Street 0
Coordinates41.12084, -73.4677
Functional classUrban Local

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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating23.3 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length35 ft (10.7 m)
Longest span31 ft (9.6 m)
Deck width33 ft (10 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic938 (2024)
Projected traffic1,394 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 Old Rock Lane over Five Mile River built?

It was built in 1987, making it 38 years old in 2025.

What condition is Old Rock Lane over Five Mile 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 Old Rock Lane over Five Mile River carry?

About 938 vehicles per day (2024 count), of which roughly 2% are trucks.

How long is Old Rock Lane over Five Mile River?

The structure is 35 ft (10.7 m) long with a longest span of 31 ft (9.6 m) and a deck 33 ft wide.

Who owns Old Rock Lane over Five Mile River?

It is owned by the City or Municipal Highway Agency.