US Bridges

US 12 over Crooked Fk.Clearwater R.

Fair

Idaho County, Idaho · 4.7 W. Ida-Mont Line · Structure no. 000000000010515

Built
1960
65 years old
Condition
Fair
inspected May 2024
Type
Tee Beam
Concrete Continuous
Length
290 ft
5 main spans
Daily traffic
610
2023 count
Owner
State
State Highway Agency

About this bridge

US 12 over Crooked Fk.Clearwater R. is a concrete continuous tee beam carrying US 12 over Crooked Fk.Clearwater R. in Idaho County, Idaho. It was built in 1960, so it is 65 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.

It carries about 610 vehicles a day, roughly 36% of them trucks, projected to reach 915 by 2042. The structure is 290 ft (88.4 m) long and 32 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesUS 12
CrossesCrooked Fk.Clearwater R.
Location4.7 W. Ida-Mont Line
RouteU.S. Route 12
CountyIdaho County
StateIdaho
Coordinates46.58042, -114.61164
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating75 US tons
Inventory rating47 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length290 ft (88.4 m)
Longest span78 ft (23.8 m)
Deck width32 ft (9.7 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic610 (2023)
Projected traffic915 by 2042
Trucks36%
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$3.2 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 12 over Crooked Fk.Clearwater R. built?

It was built in 1960, making it 65 years old in 2025.

What condition is US 12 over Crooked Fk.Clearwater R. 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 May 2024.

How much traffic does US 12 over Crooked Fk.Clearwater R. carry?

About 610 vehicles per day (2023 count), of which roughly 36% are trucks.

How long is US 12 over Crooked Fk.Clearwater R.?

The structure is 290 ft (88.4 m) long with a longest span of 78 ft (23.8 m) and a deck 32 ft wide.

Who owns US 12 over Crooked Fk.Clearwater R.?

It is owned by the State Highway Agency.