US Bridges

N 5th W over Idaho Canal

FairPosted for load

Bonneville County, Idaho · 1.1 S. 3.7 W. Ucon · Structure no. 000000000031310

Built
1956
69 years old
Condition
Fair
inspected November 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
116 ft
3 main spans
Daily traffic
1,200
2023 count
Owner
County
County Highway Agency

About this bridge

N 5th W over Idaho Canal is a prestressed concrete box beam or girders - multiple carrying N 5th W over Idaho Canal in Bonneville County, Idaho. It was built in 1956, so it is 69 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 5 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 load restriction.

It carries about 1,200 vehicles a day, roughly 21% of them trucks, projected to reach 1,800 by 2042. The structure is 116 ft (35.4 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesN 5th W
CrossesIdaho Canal
Location1.1 S. 3.7 W. Ucon
RouteCounty Highway 0
CountyBonneville County
StateIdaho
Coordinates43.57639, -112.03864
Functional classRural Minor 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating30 US tons
Inventory rating18 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length116 ft (35.4 m)
Longest span40 ft (12.2 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,200 (2023)
Projected traffic1,800 by 2042
Trucks21%
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

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.4 million (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was N 5th W over Idaho Canal built?

It was built in 1956, making it 69 years old in 2025.

What condition is N 5th W over Idaho 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 November 2023.

How much traffic does N 5th W over Idaho Canal carry?

About 1,200 vehicles per day (2023 count), of which roughly 21% are trucks.

How long is N 5th W over Idaho Canal?

The structure is 116 ft (35.4 m) long with a longest span of 40 ft (12.2 m) and a deck 27 ft wide.

Who owns N 5th W over Idaho Canal?

It is owned by the County Highway Agency.