US Bridges

Central House RD over Wyman Ravine

FairPosted for load

Butte County, California · 0.2 MI E of SH70 · Structure no. 12C0111

Built
1910
115 years old, rebuilt 1970
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
44 ft
2 main spans
Daily traffic
71
2019 count
Owner
County
County Highway Agency

About this bridge

Central House RD over Wyman Ravine is a steel stringer/multi-beam or girder carrying Central House RD over Wyman Ravine in Butte County, California. It was built in 1910 and reconstructed in 1970, so it is 115 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. Its operating status is: posted for load restriction.

It carries about 71 vehicles a day, roughly 20% of them trucks, projected to reach 213 by 2041. The structure is 44 ft (13.4 m) long and 18 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesCentral House RD
CrossesWyman Ravine
Location0.2 MI E of SH70
RouteCounty Highway 0
CountyButte County
StateCalifornia
Coordinates39.35011, -121.59885
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating20.7 US tons
Inventory rating12.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans2
Design loadUnknown
Structure length44 ft (13.4 m)
Longest span22 ft (6.7 m)
Deck width18 ft (5.5 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic71 (2019)
Projected traffic213 by 2041
Trucks20%
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 Central House RD over Wyman Ravine built?

It was built in 1910, making it 115 years old in 2025. It was reconstructed in 1970.

What condition is Central House RD 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 Central House RD over Wyman Ravine carry?

About 71 vehicles per day (2019 count), of which roughly 20% are trucks.

How long is Central House RD over Wyman Ravine?

The structure is 44 ft (13.4 m) long with a longest span of 22 ft (6.7 m) and a deck 18 ft wide.

Who owns Central House RD over Wyman Ravine?

It is owned by the County Highway Agency.