US Bridges

US 20 over Corral Creek

Fair

Camas County, Idaho · 6.8 W. Fairfield · Structure no. 000000000015005

Built
1969
56 years old
Condition
Fair
inspected July 2023
Type
Slab
Concrete Continuous
Length
33 ft
2 main spans
Daily traffic
1,900
2023 count
Owner
State
State Highway Agency

About this bridge

US 20 over Corral Creek is a concrete continuous slab carrying US 20 over Corral Creek in Camas County, Idaho. It was built in 1969, so it is 56 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 1,900 vehicles a day, roughly 25% of them trucks, projected to reach 2,850 by 2042. The structure is 33 ft (10.1 m) long and 42 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesUS 20
CrossesCorral Creek
Location6.8 W. Fairfield
RouteU.S. Route 20
CountyCamas County
StateIdaho
Coordinates43.3425, -114.92672
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.9 US tons
Inventory rating37 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length33 ft (10.1 m)
Longest span15 ft (4.6 m)
Deck width42 ft (12.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,900 (2023)
Projected traffic2,850 by 2042
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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$545,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 20 over Corral Creek built?

It was built in 1969, making it 56 years old in 2025.

What condition is US 20 over Corral Creek 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 July 2023.

How much traffic does US 20 over Corral Creek carry?

About 1,900 vehicles per day (2023 count), of which roughly 25% are trucks.

How long is US 20 over Corral Creek?

The structure is 33 ft (10.1 m) long with a longest span of 15 ft (4.6 m) and a deck 42 ft wide.

Who owns US 20 over Corral Creek?

It is owned by the State Highway Agency.