US Bridges

State Route 70 over Dudley Creek

Fair

Butte County, California · 03-BUT-070-18.50 · Structure no. 12 0143

Built
1963
62 years old
Condition
Fair
inspected May 2024
Type
Slab
Concrete Continuous
Length
32 ft
2 main spans
Daily traffic
20,700
2020 count
Owner
State
State Highway Agency

About this bridge

State Route 70 over Dudley Creek is a concrete continuous slab carrying State Route 70 over Dudley Creek in Butte County, California. It was built in 1963, so it is 62 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 20,700 vehicles a day, roughly 15% of them trucks, projected to reach 36,010 by 2041. The structure is 32 ft (9.7 m) long and 89 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

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CarriesState Route 70
CrossesDudley Creek
Location03-BUT-070-18.50
RouteState Highway 70
CountyButte County
StateCalifornia
Coordinates39.55758, -121.60188
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.8 US tons
Inventory rating37.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length32 ft (9.7 m)
Longest span15 ft (4.6 m)
Deck width89 ft (27 m)
Roadway width84 ft (25.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,700 (2020)
Projected traffic36,010 by 2041
Trucks15%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18 mi (29 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 Dudley Creek built?

It was built in 1963, making it 62 years old in 2025.

What condition is State Route 70 over Dudley 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 May 2024.

How much traffic does State Route 70 over Dudley Creek carry?

About 20,700 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is State Route 70 over Dudley Creek?

The structure is 32 ft (9.7 m) long with a longest span of 15 ft (4.6 m) and a deck 89 ft wide.

Who owns State Route 70 over Dudley Creek?

It is owned by the State Highway Agency.