US Bridges

Potlatch Road over Elk Creek Trestle

PoorPosted for load

Shoshone County, Idaho · 1.9 E. Calder · Structure no. 000000000030992

Built
1912
113 years old, rebuilt 1991
Condition
Poor
inspected August 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
85 ft
6 main spans
Daily traffic
100
2023 count
Owner
County
County Highway Agency

About this bridge

Potlatch Road over Elk Creek Trestle is a wood or timber stringer/multi-beam or girder carrying Potlatch Road over Elk Creek Trestle in Shoshone County, Idaho. It was built in 1912 and reconstructed in 1991, so it is 113 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 3 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 100 vehicles a day, roughly 5% of them trucks, projected to reach 150 by 2039. The structure is 85 ft (25.9 m) long and 13 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

CarriesPotlatch Road
CrossesElk Creek Trestle
Location1.9 E. Calder
RouteCounty Highway 0
StateIdaho
Coordinates47.26881, -116.14994
Functional classRural Minor Collector

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.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
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 rating7.1 US tons
Inventory rating4 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans6
Design loadHS 20
Structure length85 ft (25.9 m)
Longest span14 ft (4.3 m)
Deck width13 ft (4.1 m)
Roadway width12 ft (3.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2023)
Projected traffic150 by 2039
Trucks5%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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$824,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Potlatch Road over Elk Creek Trestle built?

It was built in 1912, making it 113 years old in 2025. It was reconstructed in 1991.

What condition is Potlatch Road over Elk Creek Trestle 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 Potlatch Road over Elk Creek Trestle carry?

About 100 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Potlatch Road over Elk Creek Trestle?

The structure is 85 ft (25.9 m) long with a longest span of 14 ft (4.3 m) and a deck 13 ft wide.

Who owns Potlatch Road over Elk Creek Trestle?

It is owned by the County Highway Agency.