US Bridges

Stilson Canyon RD over Little Chico Creek

Fair

Butte County, California · 1.5 MI E Humboldt RD · Structure no. 12C0193

Built
1906
119 years old, rebuilt 1945
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
47 ft
1 main span
Daily traffic
613
2019 count
Owner
County
County Highway Agency

About this bridge

Stilson Canyon RD over Little Chico Creek is a steel stringer/multi-beam or girder carrying Stilson Canyon RD over Little Chico Creek in Butte County, California. It was built in 1906 and reconstructed in 1945, so it is 119 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 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 613 vehicles a day, roughly 11% of them trucks, projected to reach 940 by 2042. The structure is 47 ft (14.2 m) long and 14 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

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CarriesStilson Canyon RD
CrossesLittle Chico Creek
Location1.5 MI E Humboldt RD
RouteCounty Highway 0
CountyButte County
StateCalifornia
Coordinates39.73523, -121.76526
Functional classUrban 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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating29.7 US tons
Inventory rating17.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length47 ft (14.2 m)
Longest span45 ft (13.6 m)
Deck width14 ft (4.2 m)
Roadway width13 ft (3.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic613 (2019)
Projected traffic940 by 2042
Trucks11%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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 Stilson Canyon RD over Little Chico Creek built?

It was built in 1906, making it 119 years old in 2025. It was reconstructed in 1945.

What condition is Stilson Canyon RD over Little Chico Creek 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 2024.

How much traffic does Stilson Canyon RD over Little Chico Creek carry?

About 613 vehicles per day (2019 count), of which roughly 11% are trucks.

How long is Stilson Canyon RD over Little Chico Creek?

The structure is 47 ft (14.2 m) long with a longest span of 45 ft (13.6 m) and a deck 14 ft wide.

Who owns Stilson Canyon RD over Little Chico Creek?

It is owned by the County Highway Agency.