US Bridges

US Route 1 over Island Brook

Fair

Fairfield County, Connecticut · 0.4 MI N of Route 8 · Structure no. 03763

Built
1972
53 years old
Condition
Fair
inspected August 2024
Type
Culvert
Concrete Continuous
Length
31 ft
2 main spans
Daily traffic
14,700
2022 count
Owner
State
State Highway Agency

About this bridge

US Route 1 over Island Brook is a concrete continuous culvert carrying US Route 1 over Island Brook in Fairfield County, Connecticut. It was built in 1972, so it is 53 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 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 14,700 vehicles a day, roughly 3% of them trucks, projected to reach 21,843 by 2042. The structure is 31 ft (9.4 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS Route 1
CrossesIsland Brook
Location0.4 MI N of Route 8
RouteU.S. Route 1
CountyFairfield County
StateConnecticut
Coordinates41.19992, -73.19234
Functional classUrban Other Principal 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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.2 US tons
Inventory rating59.6 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckOther
Main spans2
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span15 ft (4.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,700 (2022)
Projected traffic21,843 by 2042
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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 US Route 1 over Island Brook built?

It was built in 1972, making it 53 years old in 2025.

What condition is US Route 1 over Island Brook 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 August 2024.

How much traffic does US Route 1 over Island Brook carry?

About 14,700 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is US Route 1 over Island Brook?

The structure is 31 ft (9.4 m) long with a longest span of 15 ft (4.6 m).

Who owns US Route 1 over Island Brook?

It is owned by the State Highway Agency.