US Bridges

Humboldt RD over Butte Creek

Fair

Butte County, California · 9.1 MI E S.R. 32 · Structure no. 12C0184

Built
1938
87 years old
Condition
Fair
inspected July 2024
Type
Girder and Floorbeam System
Steel
Length
51 ft
1 main span
Daily traffic
320
2020 count
Owner
County
County Highway Agency

About this bridge

Humboldt RD over Butte Creek is a steel girder and floorbeam system carrying Humboldt RD over Butte Creek in Butte County, California. It was built in 1938, so it is 87 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 320 vehicles a day, roughly 17% of them trucks, projected to reach 435 by 2041. The structure is 51 ft (15.6 m) long and 18 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesHumboldt RD
CrossesButte Creek
Location9.1 MI E S.R. 32
RouteCounty Highway 0
CountyButte County
StateCalifornia
Coordinates40.10039, -121.50047
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 2024
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating32.2 US tons
Inventory rating19.3 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadH 15
Structure length51 ft (15.6 m)
Longest span49 ft (15 m)
Deck width18 ft (5.4 m)
Roadway width17 ft (5.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic320 (2020)
Projected traffic435 by 2041
Trucks17%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 Humboldt RD over Butte Creek built?

It was built in 1938, making it 87 years old in 2025.

What condition is Humboldt RD over Butte 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 Humboldt RD over Butte Creek carry?

About 320 vehicles per day (2020 count), of which roughly 17% are trucks.

How long is Humboldt RD over Butte Creek?

The structure is 51 ft (15.6 m) long with a longest span of 49 ft (15 m) and a deck 18 ft wide.

Who owns Humboldt RD over Butte Creek?

It is owned by the County Highway Agency.