US Bridges

Lone Tree Road over Wyman Ravine

Fair

Butte County, California · 1.8 MI S Palermo RD · Structure no. 12C0110

Built
1992
33 years old
Condition
Fair
inspected May 2023
Type
Slab
Concrete Continuous
Length
88 ft
3 main spans
Daily traffic
871
2019 count
Owner
County
County Highway Agency

About this bridge

Lone Tree Road over Wyman Ravine is a concrete continuous slab carrying Lone Tree Road over Wyman Ravine in Butte County, California. It was built in 1992, so it is 33 years old, younger 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 871 vehicles a day, roughly 25% of them trucks, projected to reach 1,408 by 2041. The structure is 88 ft (26.8 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesLone Tree Road
CrossesWyman Ravine
Location1.8 MI S Palermo RD
RouteCounty Highway 0
CountyButte County
StateCalifornia
Coordinates39.4091, -121.5766
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length88 ft (26.8 m)
Longest span34 ft (10.4 m)
Deck width31 ft (9.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic871 (2019)
Projected traffic1,408 by 2041
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Lone Tree Road over Wyman Ravine built?

It was built in 1992, making it 33 years old in 2025.

What condition is Lone Tree 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 Lone Tree Road over Wyman Ravine carry?

About 871 vehicles per day (2019 count), of which roughly 25% are trucks.

How long is Lone Tree Road over Wyman Ravine?

The structure is 88 ft (26.8 m) long with a longest span of 34 ft (10.4 m) and a deck 31 ft wide.

Who owns Lone Tree Road over Wyman Ravine?

It is owned by the County Highway Agency.