US Bridges

550 West Road over Long Island Canal

Fair

Jefferson County, Idaho · 0.2 N. 0.9 W. Labelle · Structure no. 000000000032340

Built
1973
52 years old
Condition
Fair
inspected March 2024
Type
Tee Beam
Prestressed Concrete
Length
24 ft
1 main span
Daily traffic
40
2023 count
Owner
County
County Highway Agency

About this bridge

550 West Road over Long Island Canal is a prestressed concrete tee beam carrying 550 West Road over Long Island Canal in Jefferson County, Idaho. It was built in 1973, so it is 52 years old, older than the Idaho average of 45.3 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 40 vehicles a day, roughly 10% of them trucks, projected to reach 60 by 2039. The structure is 24 ft (7.3 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Carries550 West Road
CrossesLong Island Canal
Location0.2 N. 0.9 W. Labelle
RouteCounty Highway 0
StateIdaho
Coordinates43.70639, -111.87386
Functional classRural 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length24 ft (7.3 m)
Longest span23 ft (7 m)
Deck width28 ft (8.6 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2023)
Projected traffic60 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 550 West Road over Long Island Canal built?

It was built in 1973, making it 52 years old in 2025.

What condition is 550 West Road over Long Island Canal 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 March 2024.

How much traffic does 550 West Road over Long Island Canal carry?

About 40 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is 550 West Road over Long Island Canal?

The structure is 24 ft (7.3 m) long with a longest span of 23 ft (7 m) and a deck 28 ft wide.

Who owns 550 West Road over Long Island Canal?

It is owned by the County Highway Agency.