US Bridges

Old Red Bluff RD over North Fork Feather River

Fair

Plumas County, California · 7.0 MI W Warner Creek RD · Structure no. 09C0052

Built
1956
69 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete Continuous
Length
70 ft
3 main spans
Daily traffic
130
2019 count
Owner
County
County Highway Agency

About this bridge

Old Red Bluff RD over North Fork Feather River is a concrete continuous slab carrying Old Red Bluff RD over North Fork Feather River in Plumas County, California. It was built in 1956, so it is 69 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 130 vehicles a day, roughly 3% of them trucks, projected to reach 236 by 2041. The structure is 70 ft (21.3 m) long and 16 ft wide. If it were closed, the detour would be 24.9 mi (40 km).

CarriesOld Red Bluff RD
CrossesNorth Fork Feather River
Location7.0 MI W Warner Creek RD
RouteCounty Highway 0
Coordinates40.35441, -121.41761
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating66 US tons
Inventory rating39.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length70 ft (21.3 m)
Longest span30 ft (9.1 m)
Deck width16 ft (4.8 m)
Roadway width14 ft (4.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic130 (2019)
Projected traffic236 by 2041
Trucks3%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.9 mi (40 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Old Red Bluff RD over North Fork Feather River built?

It was built in 1956, making it 69 years old in 2025.

What condition is Old Red Bluff RD over North 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 2023.

How much traffic does Old Red Bluff RD over North Fork Feather River carry?

About 130 vehicles per day (2019 count), of which roughly 3% are trucks.

How long is Old Red Bluff RD over North Fork Feather River?

The structure is 70 ft (21.3 m) long with a longest span of 30 ft (9.1 m) and a deck 16 ft wide.

Who owns Old Red Bluff RD over North Fork Feather River?

It is owned by the County Highway Agency.