US Bridges

Philbrook Road over West Branch Feather Riv

Good

Butte County, California · 0.5 MI S JCT Humbug Road · Structure no. 12C0389

Built
1970
55 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
147 ft
3 main spans
Daily traffic
120
2015 count
Owner
County
County Highway Agency

About this bridge

Philbrook Road over West Branch Feather Riv is a steel stringer/multi-beam or girder carrying Philbrook Road over West Branch Feather Riv in Butte County, California. It was built in 1970, so it is 55 years old, older than the California average of 54.8 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 120 vehicles a day, roughly 12% of them trucks, projected to reach 420 by 2042. The structure is 147 ft (44.7 m) long and 20 ft wide. If it were closed, the detour would be 26.1 mi (42 km).

Location

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CarriesPhilbrook Road
CrossesWest Branch Feather Riv
Location0.5 MI S JCT Humbug Road
RouteCounty Highway 0
CountyButte County
StateCalifornia
Coordinates40.04395, -121.49851
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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating84.7 US tons
Inventory rating50.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length147 ft (44.7 m)
Longest span62 ft (18.8 m)
Deck width20 ft (6.1 m)
Roadway width18 ft (5.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic120 (2015)
Projected traffic420 by 2042
Trucks12%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.1 mi (42 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Philbrook Road over West Branch Feather Riv built?

It was built in 1970, making it 55 years old in 2025.

What condition is Philbrook Road over West Branch Feather Riv 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 2024.

How much traffic does Philbrook Road over West Branch Feather Riv carry?

About 120 vehicles per day (2015 count), of which roughly 12% are trucks.

How long is Philbrook Road over West Branch Feather Riv?

The structure is 147 ft (44.7 m) long with a longest span of 62 ft (18.8 m) and a deck 20 ft wide.

Who owns Philbrook Road over West Branch Feather Riv?

It is owned by the County Highway Agency.