US Bridges

STC4715;CLEARCREEK over Clear Creek

FairPosted for load

Idaho County, Idaho · 6.4 S. 5.2 E. Kooskia · Structure no. 000000000029255

Built
1965
60 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
63 ft
1 main span
Daily traffic
340
2023 count
Owner
County
County Highway Agency

About this bridge

STC4715;CLEARCREEK over Clear Creek is a steel stringer/multi-beam or girder carrying STC4715;CLEARCREEK over Clear Creek in Idaho County, Idaho. It was built in 1965, so it is 60 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 340 vehicles a day, roughly 3% of them trucks, projected to reach 510 by 2042. The structure is 63 ft (19.2 m) long and 18 ft wide. If it were closed, the detour would be 29.8 mi (48 km).

Location

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CarriesSTC4715;CLEARCREEK
CrossesClear Creek
Location6.4 S. 5.2 E. Kooskia
RouteCounty Highway 4715
CountyIdaho County
StateIdaho
Coordinates46.04719, -115.86636
Functional classRural Major 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating30 US tons
Inventory rating18 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20
Structure length63 ft (19.2 m)
Longest span61 ft (18.6 m)
Deck width18 ft (5.6 m)
Roadway width17 ft (5.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic340 (2023)
Projected traffic510 by 2042
Trucks3%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.8 mi (48 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$653,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was STC4715;CLEARCREEK over Clear Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is STC4715;CLEARCREEK over Clear 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 June 2023.

How much traffic does STC4715;CLEARCREEK over Clear Creek carry?

About 340 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is STC4715;CLEARCREEK over Clear Creek?

The structure is 63 ft (19.2 m) long with a longest span of 61 ft (18.6 m) and a deck 18 ft wide.

Who owns STC4715;CLEARCREEK over Clear Creek?

It is owned by the County Highway Agency.