US Bridges

State Route 70 over Penstock Uc

Good

Butte County, California · 03-BUT-070-44.43 · Structure no. 12 0105

Built
1950
75 years old
Condition
Good
inspected April 2023
Type
Frame
Concrete Continuous
Length
47 ft
2 main spans
Daily traffic
1,350
2020 count
Owner
State
State Highway Agency

About this bridge

State Route 70 over Penstock Uc is a concrete continuous frame carrying State Route 70 over Penstock Uc 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,350 vehicles a day, roughly 14% of them trucks, projected to reach 2,289 by 2041. The structure is 47 ft (14.3 m) long and 50 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesState Route 70
CrossesPenstock Uc
Location03-BUT-070-44.43
RouteState Highway 70
Coordinates39.82628, -121.40875
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.2 US tons
Inventory rating32.2 US tons

Structure

Structure typeFrame
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length47 ft (14.3 m)
Longest span15 ft (4.7 m)
Deck width50 ft (15.2 m)
Roadway width48 ft (14.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,350 (2020)
Projected traffic2,289 by 2041
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesOther
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was State Route 70 over Penstock Uc built?

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

What condition is State Route 70 over Penstock Uc in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2023.

How much traffic does State Route 70 over Penstock Uc carry?

About 1,350 vehicles per day (2020 count), of which roughly 14% are trucks.

How long is State Route 70 over Penstock Uc?

The structure is 47 ft (14.3 m) long with a longest span of 15 ft (4.7 m) and a deck 50 ft wide.

Who owns State Route 70 over Penstock Uc?

It is owned by the State Highway Agency.