US Bridges

Cox Lane over Wyman Ravine

Fair

Butte County, California · 0.4 MI E of SH 70 · Structure no. 12C0358

Built
1989
36 years old
Condition
Fair
inspected July 2023
Type
Slab
Concrete Continuous
Length
88 ft
3 main spans
Daily traffic
300
2019 count
Owner
County
County Highway Agency

About this bridge

Cox Lane over Wyman Ravine is a concrete continuous slab carrying Cox Lane over Wyman Ravine in Butte County, California. It was built in 1989, so it is 36 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 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 300 vehicles a day, roughly 27% of them trucks, projected to reach 265 by 2041. The structure is 88 ft (26.8 m) long and 29 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesCox Lane
CrossesWyman Ravine
Location0.4 MI E of SH 70
RouteCounty Highway 0
CountyButte County
StateCalifornia
Coordinates39.38258, -121.60454
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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 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 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 width29 ft (8.7 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2019)
Projected traffic265 by 2041
Trucks27%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 Cox Lane over Wyman Ravine built?

It was built in 1989, making it 36 years old in 2025.

What condition is Cox Lane 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 July 2023.

How much traffic does Cox Lane over Wyman Ravine carry?

About 300 vehicles per day (2019 count), of which roughly 27% are trucks.

How long is Cox Lane 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 29 ft wide.

Who owns Cox Lane over Wyman Ravine?

It is owned by the County Highway Agency.