US Bridges

Timberline Road over E. Fk. Wood River

FairPosted for load

Blaine County, Idaho · 1.1 E Gimlet · Structure no. 000000000023743

Built
1920
105 years old, rebuilt 1950
Condition
Fair
inspected September 2024
Type
Girder and Floorbeam System
Steel
Length
42 ft
1 main span
Daily traffic
40
2023 count
Owner
County
County Highway Agency

About this bridge

Timberline Road over E. Fk. Wood River is a steel girder and floorbeam system carrying Timberline Road over E. Fk. Wood River in Blaine County, Idaho. It was built in 1920 and reconstructed in 1950, so it is 105 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. Its operating status is: posted for load restriction.

It carries about 40 vehicles a day, roughly 5% of them trucks, projected to reach 60 by 2040. The structure is 42 ft (12.8 m) long and 19 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesTimberline Road
CrossesE. Fk. Wood River
Location1.1 E Gimlet
RouteCounty Highway 0
CountyBlaine County
StateIdaho
Coordinates43.60319, -114.32997
Functional classRural Local

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 protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating15 US tons
Inventory rating9 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckSteel plate
Main spans1
Design loadUnknown
Structure length42 ft (12.8 m)
Longest span41 ft (12.6 m)
Deck width19 ft (5.9 m)
Roadway width19 ft (5.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2023)
Projected traffic60 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-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$429,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Timberline Road over E. Fk. Wood River built?

It was built in 1920, making it 105 years old in 2025. It was reconstructed in 1950.

What condition is Timberline Road over E. Fk. Wood River 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 September 2024.

How much traffic does Timberline Road over E. Fk. Wood River carry?

About 40 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Timberline Road over E. Fk. Wood River?

The structure is 42 ft (12.8 m) long with a longest span of 41 ft (12.6 m) and a deck 19 ft wide.

Who owns Timberline Road over E. Fk. Wood River?

It is owned by the County Highway Agency.