US Bridges

State Route 70 over Clear Stream

Good

Plumas County, California · 02-PLU-070-42.86 · Structure no. 09 0075

Built
1937
88 years old, rebuilt 1975
Condition
Good
inspected June 2023
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
6,700
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 70 over Clear Stream is a concrete continuous culvert carrying State Route 70 over Clear Stream in Plumas County, California. It was built in 1937 and reconstructed in 1975, so it is 88 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 6,700 vehicles a day, roughly 2% of them trucks, projected to reach 3,673 by 2040. The structure is 22 ft (6.7 m) long and 98 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesState Route 70
CrossesClear Stream
Location02-PLU-070-42.86
RouteState Highway 70
CountyPlumas County
StateCalifornia
Coordinates39.94054, -120.95222
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 15
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width98 ft (29.8 m)
Roadway width82 ft (25 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,700 (2009)
Projected traffic3,673 by 2040
Trucks2%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Route 70 over Clear Stream built?

It was built in 1937, making it 88 years old in 2025. It was reconstructed in 1975.

What condition is State Route 70 over Clear Stream 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 June 2023.

How much traffic does State Route 70 over Clear Stream carry?

About 6,700 vehicles per day (2009 count), of which roughly 2% are trucks.

How long is State Route 70 over Clear Stream?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m) and a deck 98 ft wide.

Who owns State Route 70 over Clear Stream?

It is owned by the State Highway Agency.