US Bridges

Road 22N57 over So Fork Feather River

Fair

Plumas County, California · No Data Entered · Structure no. 051153000001072

Built
1960
65 years old, rebuilt 2000
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
48 ft
1 main span
Daily traffic
40
1980 count
Owner
Federal
U.S. Forest Service

About this bridge

Road 22N57 over So Fork Feather River is a wood or timber stringer/multi-beam or girder carrying Road 22N57 over So Fork Feather River in Plumas County, California. It was built in 1960 and reconstructed in 2000, so it is 65 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 40 vehicles a day, projected to reach 60 by 2045. The structure is 48 ft (14.6 m) long and 16 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

CarriesRoad 22N57
CrossesSo Fork Feather River
LocationNo Data Entered
RouteFederal Lands Road 22N57
Coordinates39.74931, -120.96227
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation*: *
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating—
Inventory rating—

Structure

MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20 + Mod
Structure length48 ft (14.6 m)
Longest span47 ft (14.3 m)
Deck width16 ft (4.8 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (1980)
Projected traffic60 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 Road 22N57 over So Fork Feather River built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 2000.

What condition is Road 22N57 over So Fork Feather River 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 2024.

How much traffic does Road 22N57 over So Fork Feather River carry?

About 40 vehicles per day (1980 count).

How long is Road 22N57 over So Fork Feather River?

The structure is 48 ft (14.6 m) long with a longest span of 47 ft (14.3 m) and a deck 16 ft wide.

Who owns Road 22N57 over So Fork Feather River?

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