US Bridges

State Route 70 over Greenhorn Creek

Fair

Plumas County, California · 02-PLU-070-47.74 · Structure no. 09 0020

Built
1941
84 years old
Condition
Fair
inspected June 2023
Type
Culvert
Concrete Continuous
Length
37 ft
3 main spans
Daily traffic
3,425
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 70 over Greenhorn Creek is a concrete continuous culvert carrying State Route 70 over Greenhorn Creek in Plumas County, California. It was built in 1941, so it is 84 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 3,425 vehicles a day, roughly 11% of them trucks, projected to reach 8,337 by 2040. The structure is 37 ft (11.4 m) long and 37 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesState Route 70
CrossesGreenhorn Creek
Location02-PLU-070-47.74
RouteState Highway 70
CountyPlumas County
StateCalifornia
Coordinates39.93566, -120.8662
Functional classRural Minor Arterial

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
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 spans3
Design loadUnknown
Structure length37 ft (11.4 m)
Longest span12 ft (3.7 m)
Deck width37 ft (11.3 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,425 (2009)
Projected traffic8,337 by 2040
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Greenhorn Creek built?

It was built in 1941, making it 84 years old in 2025.

What condition is State Route 70 over Greenhorn 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 June 2023.

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

About 3,425 vehicles per day (2009 count), of which roughly 11% are trucks.

How long is State Route 70 over Greenhorn Creek?

The structure is 37 ft (11.4 m) long with a longest span of 12 ft (3.7 m) and a deck 37 ft wide.

Who owns State Route 70 over Greenhorn Creek?

It is owned by the State Highway Agency.