US Bridges

Forest Road 642 over So. Fk. White Bird Creek

Good

Idaho County, Idaho · No Data Entered · Structure no. 011701000013107

Built
2008
17 years old
Condition
Good
inspected August 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
50 ft
1 main span
Daily traffic
25
Owner
Federal
U.S. Forest Service

About this bridge

Forest Road 642 over So. Fk. White Bird Creek is a prestressed concrete stringer/multi-beam or girder carrying Forest Road 642 over So. Fk. White Bird Creek in Idaho County, Idaho. It was built in 2008, so it is 17 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 25 vehicles a day, projected to reach 37 by 2045. The structure is 50 ft (15.3 m) long and 23 ft wide. If it were closed, the detour would be 620.7 mi (999 km).

Location

Open in Google Maps
CarriesForest Road 642
CrossesSo. Fk. White Bird Creek
LocationNo Data Entered
RouteFederal Lands Road 642
CountyIdaho County
StateIdaho
Coordinates45.76562, -116.06492
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating40.7 US tons
Inventory rating31.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length50 ft (15.3 m)
Longest span48 ft (14.7 m)
Deck width23 ft (6.9 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (—)
Projected traffic37 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed620.7 mi (999 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Forest Road 642 over So. Fk. White Bird Creek built?

It was built in 2008, making it 17 years old in 2025.

What condition is Forest Road 642 over So. Fk. White Bird 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 August 2022.

How much traffic does Forest Road 642 over So. Fk. White Bird Creek carry?

About 25 vehicles per day (latest count).

How long is Forest Road 642 over So. Fk. White Bird Creek?

The structure is 50 ft (15.3 m) long with a longest span of 48 ft (14.7 m) and a deck 23 ft wide.

Who owns Forest Road 642 over So. Fk. White Bird Creek?

It is owned by the U.S. Forest Service.