US Bridges

STC4710;GRAVES Crk over Rock Creek

Good

Idaho County, Idaho · 9.7 S. 2.2 W. Cottonwood · Structure no. 000000000029381

Built
1998
27 years old
Condition
Good
inspected June 2022
Type
Tee Beam
Prestressed Concrete
Length
99 ft
1 main span
Daily traffic
30
2023 count
Owner
Local
Other Local Agency

About this bridge

STC4710;GRAVES Crk over Rock Creek is a prestressed concrete tee beam carrying STC4710;GRAVES Crk over Rock Creek in Idaho County, Idaho. It was built in 1998, so it is 27 years old, younger than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 30 vehicles a day, roughly 50% of them trucks, projected to reach 45 by 2042. The structure is 99 ft (30.2 m) long and 36 ft wide. If it were closed, the detour would be 29.8 mi (48 km).

Location

Open in Google Maps
CarriesSTC4710;GRAVES Crk
CrossesRock Creek
Location9.7 S. 2.2 W. Cottonwood
RouteCounty Highway 4710
CountyIdaho County
StateIdaho
Coordinates45.90774, -116.39693
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJune 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating98 US tons
Inventory rating53 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length99 ft (30.2 m)
Longest span94 ft (28.7 m)
Deck width36 ft (11.1 m)
Roadway width33 ft (10.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2023)
Projected traffic45 by 2042
Trucks50%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.8 mi (48 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was STC4710;GRAVES Crk over Rock Creek built?

It was built in 1998, making it 27 years old in 2025.

What condition is STC4710;GRAVES Crk over Rock Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2022.

How much traffic does STC4710;GRAVES Crk over Rock Creek carry?

About 30 vehicles per day (2023 count), of which roughly 50% are trucks.

How long is STC4710;GRAVES Crk over Rock Creek?

The structure is 99 ft (30.2 m) long with a longest span of 94 ft (28.7 m) and a deck 36 ft wide.

Who owns STC4710;GRAVES Crk over Rock Creek?

It is owned by the Other Local Agency.