US Bridges

US 20 Wbl over Idaho Canal

Fair

Bonneville County, Idaho · 2.5 N. Idaho Falls · Structure no. 000000000012370

Built
1970
55 years old, rebuilt 2008
Condition
Fair
inspected March 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
81 ft
1 main span
Daily traffic
13,000
2023 count
Owner
State
State Highway Agency

About this bridge

US 20 Wbl over Idaho Canal is a prestressed concrete stringer/multi-beam or girder carrying US 20 Wbl over Idaho Canal in Bonneville County, Idaho. It was built in 1970 and reconstructed in 2008, so it is 55 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 13,000 vehicles a day, roughly 11% of them trucks, projected to reach 19,500 by 2042. The structure is 81 ft (24.7 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 20 Wbl
CrossesIdaho Canal
Location2.5 N. Idaho Falls
RouteU.S. Route 20
CountyBonneville County
StateIdaho
Coordinates43.52984, -112.01892
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.1 US tons
Inventory rating43 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length81 ft (24.7 m)
Longest span80 ft (24.4 m)
Deck width44 ft (13.3 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,000 (2023)
Projected traffic19,500 by 2042
Trucks11%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 20 Wbl over Idaho Canal built?

It was built in 1970, making it 55 years old in 2025. It was reconstructed in 2008.

What condition is US 20 Wbl 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 March 2022.

How much traffic does US 20 Wbl over Idaho Canal carry?

About 13,000 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is US 20 Wbl over Idaho Canal?

The structure is 81 ft (24.7 m) long with a longest span of 80 ft (24.4 m) and a deck 44 ft wide.

Who owns US 20 Wbl over Idaho Canal?

It is owned by the State Highway Agency.