US Bridges

STC3883;CLEAR Crk over Grimes Creek

Fair

Boise County, Idaho · 5.0 S. 7.3 W. Idaho City · Structure no. 000000000026645

Built
1930
95 years old, rebuilt 1995
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
46 ft
1 main span
Daily traffic
310
2023 count
Owner
County
County Highway Agency

About this bridge

STC3883;CLEAR Crk over Grimes Creek is a steel stringer/multi-beam or girder carrying STC3883;CLEAR Crk over Grimes Creek in Boise County, Idaho. It was built in 1930 and reconstructed in 1995, so it is 95 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.

It carries about 310 vehicles a day, roughly 19% of them trucks, projected to reach 465 by 2042. The structure is 46 ft (14 m) long and 24 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

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CarriesSTC3883;CLEAR Crk
CrossesGrimes Creek
Location5.0 S. 7.3 W. Idaho City
RouteCounty Highway 3883
CountyBoise County
StateIdaho
Coordinates43.75536, -115.97785
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating99.9 US tons
Inventory rating75 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20
Structure length46 ft (14 m)
Longest span42 ft (12.8 m)
Deck width24 ft (7.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic310 (2023)
Projected traffic465 by 2042
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was STC3883;CLEAR Crk over Grimes Creek built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1995.

What condition is STC3883;CLEAR Crk over Grimes 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 September 2023.

How much traffic does STC3883;CLEAR Crk over Grimes Creek carry?

About 310 vehicles per day (2023 count), of which roughly 19% are trucks.

How long is STC3883;CLEAR Crk over Grimes Creek?

The structure is 46 ft (14 m) long with a longest span of 42 ft (12.8 m) and a deck 24 ft wide.

Who owns STC3883;CLEAR Crk over Grimes Creek?

It is owned by the County Highway Agency.