US Bridges

Reservation Line R over Cottonwood Creek

Fair

Idaho County, Idaho · 7.6 N. 1.1 W. Grangeville · Structure no. 000000000029201

Built
1993
32 years old
Condition
Fair
inspected September 2023
Type
Tee Beam
Concrete
Length
52 ft
1 main span
Daily traffic
120
2023 count
Owner
Local
Other Local Agency

About this bridge

Reservation Line R over Cottonwood Creek is a concrete tee beam carrying Reservation Line R over Cottonwood Creek in Idaho County, Idaho. It was built in 1993, so it is 32 years old, younger 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 120 vehicles a day, roughly 20% of them trucks, projected to reach 180 by 2042. The structure is 52 ft (15.8 m) long and 30 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesReservation Line R
CrossesCottonwood Creek
Location7.6 N. 1.1 W. Grangeville
RouteCounty Highway 0
CountyIdaho County
StateIdaho
Coordinates46.03592, -116.14003
Functional classRural Minor 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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating29 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length52 ft (15.8 m)
Longest span50 ft (15.2 m)
Deck width30 ft (9.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic120 (2023)
Projected traffic180 by 2042
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 Reservation Line R over Cottonwood Creek built?

It was built in 1993, making it 32 years old in 2025.

What condition is Reservation Line R over Cottonwood 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 Reservation Line R over Cottonwood Creek carry?

About 120 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is Reservation Line R over Cottonwood Creek?

The structure is 52 ft (15.8 m) long with a longest span of 50 ft (15.2 m) and a deck 30 ft wide.

Who owns Reservation Line R over Cottonwood Creek?

It is owned by the Other Local Agency.