US Bridges

White Bird Ridge over Little Salmon River

Good

Idaho County, Idaho · 2.6 S. Pollock · Structure no. 000000000029311

Built
2004
21 years old
Condition
Good
inspected September 2024
Type
Tee Beam
Prestressed Concrete
Length
136 ft
1 main span
Daily traffic
100
2023 count
Owner
County
County Highway Agency

About this bridge

White Bird Ridge over Little Salmon River is a prestressed concrete tee beam carrying White Bird Ridge over Little Salmon River in Idaho County, Idaho. It was built in 2004, so it is 21 years old, younger than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 100 vehicles a day, roughly 15% of them trucks, projected to reach 150 by 2039. The structure is 136 ft (41.5 m) long and 15 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesWhite Bird Ridge
CrossesLittle Salmon River
Location2.6 S. Pollock
RouteCounty Highway 0
StateIdaho
Coordinates45.27808, -116.34631
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating64 US tons
Inventory rating38 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length136 ft (41.5 m)
Longest span134 ft (40.8 m)
Deck width15 ft (4.6 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2023)
Projected traffic150 by 2039
Trucks15%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.2 million (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was White Bird Ridge over Little Salmon River built?

It was built in 2004, making it 21 years old in 2025.

What condition is White Bird Ridge over Little Salmon River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2024.

How much traffic does White Bird Ridge over Little Salmon River carry?

About 100 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is White Bird Ridge over Little Salmon River?

The structure is 136 ft (41.5 m) long with a longest span of 134 ft (40.8 m) and a deck 15 ft wide.

Who owns White Bird Ridge over Little Salmon River?

It is owned by the County Highway Agency.