US Bridges

Johnson Clan Ave over Live Oak Slough

Fair

Butte County, California · 0.2 MI W/O Larkin RD · Structure no. 12C0378

Built
1950
75 years old
Condition
Fair
inspected February 2025
Type
Slab
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
110
2019 count
Owner
County
County Highway Agency

About this bridge

Johnson Clan Ave over Live Oak Slough is a concrete continuous slab carrying Johnson Clan Ave over Live Oak Slough in Butte County, California. It was built in 1950, so it is 75 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 110 vehicles a day, roughly 3% of them trucks, projected to reach 240 by 2047. The structure is 22 ft (6.7 m) long and 26 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesJohnson Clan Ave
CrossesLive Oak Slough
Location0.2 MI W/O Larkin RD
RouteCounty Highway 0
CountyButte County
StateCalifornia
Coordinates39.31793, -121.66443
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 inspectionFebruary 2025
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span11 ft (3.4 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic110 (2019)
Projected traffic240 by 2047
Trucks3%
Lanes on structure2
Traffic directionTwo-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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Johnson Clan Ave over Live Oak Slough built?

It was built in 1950, making it 75 years old in 2025.

What condition is Johnson Clan Ave over Live Oak Slough 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 February 2025.

How much traffic does Johnson Clan Ave over Live Oak Slough carry?

About 110 vehicles per day (2019 count), of which roughly 3% are trucks.

How long is Johnson Clan Ave over Live Oak Slough?

The structure is 22 ft (6.7 m) long with a longest span of 11 ft (3.4 m) and a deck 26 ft wide.

Who owns Johnson Clan Ave over Live Oak Slough?

It is owned by the County Highway Agency.