US Bridges

Stimpson RD over Wyman Ravine

Fair

Butte County, California · 0.2 MI E of SH70 · Structure no. 12C0223

Built
1935
90 years old
Condition
Fair
inspected July 2023
Type
Tee Beam
Concrete
Length
31 ft
1 main span
Daily traffic
500
2019 count
Owner
County
County Highway Agency

About this bridge

Stimpson RD over Wyman Ravine is a concrete tee beam carrying Stimpson RD over Wyman Ravine in Butte County, California. It was built in 1935, so it is 90 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 500 vehicles a day, roughly 15% of them trucks, projected to reach 734 by 2041. The structure is 31 ft (9.4 m) long and 24 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesStimpson RD
CrossesWyman Ravine
Location0.2 MI E of SH70
RouteCounty Highway 0
CountyButte County
StateCalifornia
Coordinates39.36479, -121.60264
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.
Superstructure7 GoodSome minor problems.
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 statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 alignment8: Equal to present desirable criteria
Operating rating28.5 US tons
Inventory rating17.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length31 ft (9.4 m)
Longest span30 ft (9.2 m)
Deck width24 ft (7.2 m)
Roadway width22 ft (6.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2019)
Projected traffic734 by 2041
Trucks15%
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 Stimpson RD over Wyman Ravine built?

It was built in 1935, making it 90 years old in 2025.

What condition is Stimpson 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 Stimpson RD over Wyman Ravine carry?

About 500 vehicles per day (2019 count), of which roughly 15% are trucks.

How long is Stimpson RD over Wyman Ravine?

The structure is 31 ft (9.4 m) long with a longest span of 30 ft (9.2 m) and a deck 24 ft wide.

Who owns Stimpson RD over Wyman Ravine?

It is owned by the County Highway Agency.