US Bridges

Zumwalt Road over S.Fk. Cottonwood Creek

Good

Idaho County, Idaho · 4.8 N. 3.0 W. Grangeville · Structure no. 000000000029126

Built
2017
8 years old
Condition
Good
inspected September 2023
Type
Culvert
Aluminum, Wrought Iron, or Cast Iron
Length
20 ft
1 main span
Daily traffic
50
2023 count
Owner
Local
Other Local Agency

About this bridge

Zumwalt Road over S.Fk. Cottonwood Creek is a aluminum, wrought iron, or cast iron culvert carrying Zumwalt Road over S.Fk. Cottonwood Creek in Idaho County, Idaho. It was built in 2017, so it is 8 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 50 vehicles a day, roughly 10% of them trucks, projected to reach 75 by 2039. The structure is 20 ft (6.1 m) long and 49 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesZumwalt Road
CrossesS.Fk. Cottonwood Creek
Location4.8 N. 3.0 W. Grangeville
RouteCounty Highway 0
CountyIdaho County
StateIdaho
Coordinates45.99569, -116.18092
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating75.9 US tons
Inventory rating45 US tons

Structure

Structure typeCulvert
MaterialAluminum, Wrought Iron, or Cast Iron
DeckNot applicable
Main spans1
Design loadHS 25 or greater
Structure length20 ft (6.1 m)
Longest span20 ft (6.1 m)
Deck width49 ft (15 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic75 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Zumwalt Road over S.Fk. Cottonwood Creek built?

It was built in 2017, making it 8 years old in 2025.

What condition is Zumwalt Road over S.Fk. Cottonwood 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 September 2023.

How much traffic does Zumwalt Road over S.Fk. Cottonwood Creek carry?

About 50 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Zumwalt Road over S.Fk. Cottonwood Creek?

The structure is 20 ft (6.1 m) long with a longest span of 20 ft (6.1 m) and a deck 49 ft wide.

Who owns Zumwalt Road over S.Fk. Cottonwood Creek?

It is owned by the Other Local Agency.