US Bridges

State Route 89 over Middle Fork Feather Riv

Fair

Plumas County, California · 02-PLU-089-8.23 · Structure no. 09 0063

Built
1955
70 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
223 ft
3 main spans
Daily traffic
2,025
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 89 over Middle Fork Feather Riv is a steel continuous stringer/multi-beam or girder carrying State Route 89 over Middle Fork Feather Riv in Plumas County, California. It was built in 1955, so it is 70 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 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 2,025 vehicles a day, roughly 16% of them trucks, projected to reach 873 by 2040. The structure is 223 ft (67.9 m) long and 32 ft wide. If it were closed, the detour would be 13 mi (21 km).

CarriesState Route 89
CrossesMiddle Fork Feather Riv
Location02-PLU-089-8.23
RouteState Highway 89
Coordinates39.77773, -120.62106
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.2 US tons
Inventory rating41.1 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length223 ft (67.9 m)
Longest span87 ft (26.4 m)
Deck width32 ft (9.8 m)
Roadway width31 ft (9.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,025 (2009)
Projected traffic873 by 2040
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Route 89 over Middle Fork Feather Riv built?

It was built in 1955, making it 70 years old in 2025.

What condition is State Route 89 over Middle Fork Feather Riv 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 June 2023.

How much traffic does State Route 89 over Middle Fork Feather Riv carry?

About 2,025 vehicles per day (2009 count), of which roughly 16% are trucks.

How long is State Route 89 over Middle Fork Feather Riv?

The structure is 223 ft (67.9 m) long with a longest span of 87 ft (26.4 m) and a deck 32 ft wide.

Who owns State Route 89 over Middle Fork Feather Riv?

It is owned by the State Highway Agency.