US Bridges

US 12 over Clearwater River;bnrr

Fair

Nez Perce County, Idaho · In Lewiston · Structure no. 000000000010375

Built
1951
74 years old, rebuilt 2024
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,352 ft
12 main spans
Daily traffic
21,000
2023 count
Owner
State
State Highway Agency

About this bridge

US 12 over Clearwater River;bnrr is a steel continuous stringer/multi-beam or girder carrying US 12 over Clearwater River;bnrr in Nez Perce County, Idaho. It was built in 1951 and reconstructed in 2024, so it is 74 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 21,000 vehicles a day, roughly 9% of them trucks, projected to reach 31,500 by 2042. The structure is 1,352 ft (412.1 m) long and 79 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesUS 12
CrossesClearwater River;bnrr
LocationIn Lewiston
RouteU.S. Route 12
CountyNez Perce County
StateIdaho
Coordinates46.41694, -117.00017
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure9 ExcellentNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.1 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans12
Design loadHL 93
Structure length1,352 ft (412.1 m)
Longest span113 ft (34.4 m)
Deck width79 ft (24.2 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,000 (2023)
Projected traffic31,500 by 2042
Trucks9%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway, waterway and railroad
Detour if closed8.1 mi (13 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$21.6 million (2021 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was US 12 over Clearwater River;bnrr built?

It was built in 1951, making it 74 years old in 2025. It was reconstructed in 2024.

What condition is US 12 over Clearwater River;bnrr 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 December 2024.

How much traffic does US 12 over Clearwater River;bnrr carry?

About 21,000 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is US 12 over Clearwater River;bnrr?

The structure is 1,352 ft (412.1 m) long with a longest span of 113 ft (34.4 m) and a deck 79 ft wide.

Who owns US 12 over Clearwater River;bnrr?

It is owned by the State Highway Agency.