US Bridges

Rock Creek Road over Red Rock Creek

PoorPosted for load

Idaho County, Idaho · 9.5 S. 6.4 W. Kamiah · Structure no. 000000000029313

Built
1970
55 years old, rebuilt 1985
Condition
Poor
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
31 ft
1 main span
Daily traffic
200
2023 count
Owner
Local
Other Local Agency

About this bridge

Rock Creek Road over Red Rock Creek is a steel stringer/multi-beam or girder carrying Rock Creek Road over Red Rock Creek in Idaho County, Idaho. It was built in 1970 and reconstructed in 1985, 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 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 200 vehicles a day, roughly 5% of them trucks, projected to reach 300 by 2039. The structure is 31 ft (9.4 m) long and 32 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

CarriesRock Creek Road
CrossesRed Rock Creek
Location9.5 S. 6.4 W. Kamiah
RouteCounty Highway 0
StateIdaho
Coordinates46.09197, -116.16919
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.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28 US tons
Inventory rating17 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans1
Design loadH 15
Structure length31 ft (9.4 m)
Longest span30 ft (9.1 m)
Deck width32 ft (9.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2023)
Projected traffic300 by 2039
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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$420,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Rock Creek Road over Red Rock Creek built?

It was built in 1970, making it 55 years old in 2025. It was reconstructed in 1985.

What condition is Rock Creek Road over Red Rock Creek 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 September 2024.

How much traffic does Rock Creek Road over Red Rock Creek carry?

About 200 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Rock Creek Road over Red Rock Creek?

The structure is 31 ft (9.4 m) long with a longest span of 30 ft (9.1 m) and a deck 32 ft wide.

Who owns Rock Creek Road over Red Rock Creek?

It is owned by the Other Local Agency.