US Bridges

Quincy Junction RD over Greenhorn Creek

Fair

Plumas County, California · 2.2 MI N of S.H. 70 · Structure no. 09C0031

Built
1955
70 years old
Condition
Fair
inspected October 2023
Type
Slab
Concrete Continuous
Length
80 ft
4 main spans
Daily traffic
930
2019 count
Owner
County
County Highway Agency

About this bridge

Quincy Junction RD over Greenhorn Creek is a concrete continuous slab carrying Quincy Junction RD over Greenhorn Creek in Plumas County, California. It was built in 1955, so it is 70 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 930 vehicles a day, roughly 6% of them trucks, projected to reach 2,081 by 2044. The structure is 80 ft (24.4 m) long and 29 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesQuincy Junction RD
CrossesGreenhorn Creek
Location2.2 MI N of S.H. 70
RouteCounty Highway 0
CountyPlumas County
StateCalifornia
Coordinates39.95908, -120.90758
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating63.9 US tons
Inventory rating38.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length80 ft (24.4 m)
Longest span22 ft (6.7 m)
Deck width29 ft (8.7 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic930 (2019)
Projected traffic2,081 by 2044
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Quincy Junction RD over Greenhorn Creek built?

It was built in 1955, making it 70 years old in 2025.

What condition is Quincy Junction RD 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 October 2023.

How much traffic does Quincy Junction RD over Greenhorn Creek carry?

About 930 vehicles per day (2019 count), of which roughly 6% are trucks.

How long is Quincy Junction RD over Greenhorn Creek?

The structure is 80 ft (24.4 m) long with a longest span of 22 ft (6.7 m) and a deck 29 ft wide.

Who owns Quincy Junction RD over Greenhorn Creek?

It is owned by the County Highway Agency.