US Bridges

Lower Wyandotte RD over Branch Wyman Ravine

FairPosted for load

Butte County, California · 1 MI S Las Plumas Ave · Structure no. 12C0344

Built
1940
85 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
30 ft
2 main spans
Daily traffic
7,160
2019 count
Owner
County
County Highway Agency

About this bridge

Lower Wyandotte RD over Branch Wyman Ravine is a steel stringer/multi-beam or girder carrying Lower Wyandotte RD over Branch Wyman Ravine in Butte County, California. It was built in 1940, so it is 85 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 7,160 vehicles a day, roughly 2% of them trucks, projected to reach 11,757 by 2041. The structure is 30 ft (9.1 m) long and 26 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesLower Wyandotte RD
CrossesBranch Wyman Ravine
Location1 MI S Las Plumas Ave
RouteCounty Highway 0
CountyButte County
StateCalifornia
Coordinates39.46835, -121.52712
Functional classRural Minor 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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating20 US tons
Inventory rating12.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span15 ft (4.6 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,160 (2019)
Projected traffic11,757 by 2041
Trucks2%
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Lower Wyandotte RD over Branch Wyman Ravine built?

It was built in 1940, making it 85 years old in 2025.

What condition is Lower Wyandotte RD over Branch 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 March 2023.

How much traffic does Lower Wyandotte RD over Branch Wyman Ravine carry?

About 7,160 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is Lower Wyandotte RD over Branch Wyman Ravine?

The structure is 30 ft (9.1 m) long with a longest span of 15 ft (4.6 m) and a deck 26 ft wide.

Who owns Lower Wyandotte RD over Branch Wyman Ravine?

It is owned by the County Highway Agency.