US Bridges

State Route 70 over Tailing Ditch

Fair

Butte County, California · 03-BUT-070-12.63 · Structure no. 12 0063

Built
1958
67 years old
Condition
Fair
inspected May 2022
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
14,600
2020 count
Owner
State
State Highway Agency

About this bridge

State Route 70 over Tailing Ditch is a concrete continuous culvert carrying State Route 70 over Tailing Ditch in Butte County, California. It was built in 1958, so it is 67 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 14,600 vehicles a day, roughly 10% of them trucks, projected to reach 25,345 by 2043. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesState Route 70
CrossesTailing Ditch
Location03-BUT-070-12.63
RouteState Highway 70
CountyButte County
StateCalifornia
Coordinates39.47876, -121.57546
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,600 (2020)
Projected traffic25,345 by 2043
Trucks10%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 State Route 70 over Tailing Ditch built?

It was built in 1958, making it 67 years old in 2025.

What condition is State Route 70 over Tailing Ditch 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 May 2022.

How much traffic does State Route 70 over Tailing Ditch carry?

About 14,600 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is State Route 70 over Tailing Ditch?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m).

Who owns State Route 70 over Tailing Ditch?

It is owned by the State Highway Agency.