US Bridges

E Fork Road over Wildhorse Creek

Fair

Custer County, Idaho · 19 N.E. Sun Valley · Structure no. 000000000033390

Built
1970
55 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
87 ft
3 main spans
Daily traffic
25
2023 count
Owner
Local
Other Local Agency

About this bridge

E Fork Road over Wildhorse Creek is a wood or timber stringer/multi-beam or girder carrying E Fork Road over Wildhorse Creek in Custer County, Idaho. It was built in 1970, so it is 55 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 25 vehicles a day, roughly 5% of them trucks, projected to reach 38 by 2039. The structure is 87 ft (26.5 m) long and 15 ft wide. If it were closed, the detour would be 49.7 mi (80 km).

Location

Open in Google Maps
CarriesE Fork Road
CrossesWildhorse Creek
Location19 N.E. Sun Valley
RouteCounty Highway 0
CountyCuster County
StateIdaho
Coordinates43.89886, -114.09736
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
Deck7 GoodSome minor problems.
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating40 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadH 20
Structure length87 ft (26.5 m)
Longest span29 ft (8.8 m)
Deck width15 ft (4.7 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2023)
Projected traffic38 by 2039
Trucks5%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed49.7 mi (80 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther Local Agency
Maintained byOther Local Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$776,000 (2018 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was E Fork Road over Wildhorse Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is E Fork Road over Wildhorse Creek 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 July 2023.

How much traffic does E Fork Road over Wildhorse Creek carry?

About 25 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is E Fork Road over Wildhorse Creek?

The structure is 87 ft (26.5 m) long with a longest span of 29 ft (8.8 m) and a deck 15 ft wide.

Who owns E Fork Road over Wildhorse Creek?

It is owned by the Other Local Agency.