US Bridges

West Fork Road over Weiser River

Fair

Adams County, Idaho · 6.1 N. 0.5 W. Council · Structure no. 000000000026455

Built
1950
75 years old
Condition
Fair
inspected September 2023
Type
Tee Beam
Concrete
Length
44 ft
1 main span
Daily traffic
40
2023 count
Owner
County
County Highway Agency

About this bridge

West Fork Road over Weiser River is a concrete tee beam carrying West Fork Road over Weiser River in Adams County, Idaho. It was built in 1950, so it is 75 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 40 vehicles a day, roughly 50% of them trucks, projected to reach 60 by 2042. The structure is 44 ft (13.4 m) long and 27 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesWest Fork Road
CrossesWeiser River
Location6.1 N. 0.5 W. Council
RouteCounty Highway 0
CountyAdams County
StateIdaho
Coordinates44.81756, -116.44964
Functional classRural Minor Collector

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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating52 US tons
Inventory rating31 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 10
Structure length44 ft (13.4 m)
Longest span43 ft (13.1 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2023)
Projected traffic60 by 2042
Trucks50%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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$498,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was West Fork Road over Weiser River built?

It was built in 1950, making it 75 years old in 2025.

What condition is West Fork Road over Weiser 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 2023.

How much traffic does West Fork Road over Weiser River carry?

About 40 vehicles per day (2023 count), of which roughly 50% are trucks.

How long is West Fork Road over Weiser River?

The structure is 44 ft (13.4 m) long with a longest span of 43 ft (13.1 m) and a deck 27 ft wide.

Who owns West Fork Road over Weiser River?

It is owned by the County Highway Agency.