US Bridges

Palermo Road over Wyman Ravine

Fair

Butte County, California · Btwn Gene LN & Wyman Ave · Structure no. 12C0357

Built
1970
55 years old
Condition
Fair
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
82 ft
3 main spans
Daily traffic
250
2007 count
Owner
County
County Highway Agency

About this bridge

Palermo Road over Wyman Ravine is a prestressed concrete box beam or girders - multiple carrying Palermo Road over Wyman Ravine 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 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 250 vehicles a day, roughly 10% of them trucks, projected to reach 267 by 2041. The structure is 82 ft (25 m) long and 32 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesPalermo Road
CrossesWyman Ravine
LocationBtwn Gene LN & Wyman Ave
RouteCounty Highway 0
CountyButte County
StateCalifornia
Coordinates39.43448, -121.56697
Functional classRural Major Collector

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating12.9 US tons
Inventory rating5.4 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length82 ft (25 m)
Longest span27 ft (8.2 m)
Deck width32 ft (9.9 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic250 (2007)
Projected traffic267 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Palermo Road over Wyman Ravine built?

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

What condition is Palermo Road over Wyman Ravine 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 May 2023.

How much traffic does Palermo Road over Wyman Ravine carry?

About 250 vehicles per day (2007 count), of which roughly 10% are trucks.

How long is Palermo Road over Wyman Ravine?

The structure is 82 ft (25 m) long with a longest span of 27 ft (8.2 m) and a deck 32 ft wide.

Who owns Palermo Road over Wyman Ravine?

It is owned by the County Highway Agency.