US Bridges

Bull Hill/Skywy RD over Butte Creek

Fair

Butte County, California · 0.1 MI S JCT Humboldt RD · Structure no. 12C0028

Built
1979
46 years old
Condition
Fair
inspected July 2024
Type
Box Beam or Girders - Single or Spread
Concrete
Length
72 ft
1 main span
Daily traffic
210
2018 count
Owner
County
County Highway Agency

About this bridge

Bull Hill/Skywy RD over Butte Creek is a concrete box beam or girders - single or spread carrying Bull Hill/Skywy RD over Butte Creek in Butte County, California. It was built in 1979, so it is 46 years old, younger 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 210 vehicles a day, roughly 37% of them trucks, projected to reach 856 by 2046. The structure is 72 ft (21.8 m) long and 29 ft wide. If it were closed, the detour would be 37.9 mi (61 km).

CarriesBull Hill/Skywy RD
CrossesButte Creek
Location0.1 MI S JCT Humboldt RD
RouteCounty Highway 0
Coordinates40.07881, -121.55059
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating64.3 US tons
Inventory rating49.6 US tons

Structure

MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length72 ft (21.8 m)
Longest span70 ft (21.3 m)
Deck width29 ft (8.7 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic210 (2018)
Projected traffic856 by 2046
Trucks37%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed37.9 mi (61 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 Bull Hill/Skywy RD over Butte Creek built?

It was built in 1979, making it 46 years old in 2025.

What condition is Bull Hill/Skywy 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 Bull Hill/Skywy RD over Butte Creek carry?

About 210 vehicles per day (2018 count), of which roughly 37% are trucks.

How long is Bull Hill/Skywy RD over Butte Creek?

The structure is 72 ft (21.8 m) long with a longest span of 70 ft (21.3 m) and a deck 29 ft wide.

Who owns Bull Hill/Skywy RD over Butte Creek?

It is owned by the County Highway Agency.