US Bridges

US 20 Wbl & Ebl over S.Fk.Fall River Canal

Fair

Fremont County, Idaho · 1.8 S. Chester · Structure no. 000000000012645

Built
1973
52 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
76 ft
2 main spans
Daily traffic
10,500
2023 count
Owner
State
State Highway Agency

About this bridge

US 20 Wbl & Ebl over S.Fk.Fall River Canal is a prestressed concrete stringer/multi-beam or girder carrying US 20 Wbl & Ebl over S.Fk.Fall River Canal in Fremont 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 10,500 vehicles a day, roughly 12% of them trucks, projected to reach 15,750 by 2042. The structure is 76 ft (23.2 m) long and 115 ft wide. If it were closed, the detour would be 42.3 mi (68 km).

Location

Open in Google Maps
CarriesUS 20 Wbl & Ebl
CrossesS.Fk.Fall River Canal
Location1.8 S. Chester
RouteU.S. Route 20
CountyFremont County
StateIdaho
Coordinates43.98472, -111.60519
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
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 geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.9 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length76 ft (23.2 m)
Longest span37 ft (11.3 m)
Deck width115 ft (34.9 m)
Roadway width112 ft (34.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,500 (2023)
Projected traffic15,750 by 2042
Trucks12%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed42.3 mi (68 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$3 million (2018 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 20 Wbl & Ebl over S.Fk.Fall River Canal built?

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

What condition is US 20 Wbl & Ebl over S.Fk.Fall River 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 April 2023.

How much traffic does US 20 Wbl & Ebl over S.Fk.Fall River Canal carry?

About 10,500 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is US 20 Wbl & Ebl over S.Fk.Fall River Canal?

The structure is 76 ft (23.2 m) long with a longest span of 37 ft (11.3 m) and a deck 115 ft wide.

Who owns US 20 Wbl & Ebl over S.Fk.Fall River Canal?

It is owned by the State Highway Agency.