US Bridges

Elk Summit RD over South Fork Salmon River

PoorPosted for load

Valley County, Idaho · 14.6 N 4.3 W Yellow Pine · Structure no. 000000000033615

Built
1934
91 years old, rebuilt 1985
Condition
Poor
inspected August 2024
Type
Truss - Thru
Steel
Length
310 ft
1 main span
Daily traffic
10
2023 count
Owner
County
County Highway Agency

About this bridge

Elk Summit RD over South Fork Salmon River is a steel truss - thru carrying Elk Summit RD over South Fork Salmon River in Valley County, Idaho. It was built in 1934 and reconstructed in 1985, so it is 91 years old, older than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 10 vehicles a day, projected to reach 15 by 2039. The structure is 310 ft (94.5 m) long and 14 ft wide. If it were closed, the detour would be 49.7 mi (80 km).

CarriesElk Summit RD
CrossesSouth Fork Salmon River
Location14.6 N 4.3 W Yellow Pine
RouteCounty Highway 0
StateIdaho
Coordinates45.17478, -115.57978
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating5 US tons
Inventory rating2 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1 (+2 approach)
Design loadH 15
Structure length310 ft (94.5 m)
Longest span250 ft (76.2 m)
Deck width14 ft (4.4 m)
Roadway width11 ft (3.5 m)
Vertical clearance over deck15 ft (4.5 m)

Traffic and service

Average daily traffic10 (2023)
Projected traffic15 by 2039
Trucks0%
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

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$2.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Elk Summit RD over South Fork Salmon River built?

It was built in 1934, making it 91 years old in 2025. It was reconstructed in 1985.

What condition is Elk Summit RD over South Fork Salmon River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.

How much traffic does Elk Summit RD over South Fork Salmon River carry?

About 10 vehicles per day (2023 count).

How long is Elk Summit RD over South Fork Salmon River?

The structure is 310 ft (94.5 m) long with a longest span of 250 ft (76.2 m) and a deck 14 ft wide.

Who owns Elk Summit RD over South Fork Salmon River?

It is owned by the County Highway Agency.