US Bridges

Quartz Valley Road over Scott River

Fair

Siskiyou County, California · 0.3 MI S Scott River RD · Structure no. 02C0048

Built
1967
58 years old
Condition
Fair
inspected June 2024
Type
Tee Beam
Concrete Continuous
Length
303 ft
5 main spans
Daily traffic
329
2011 count
Owner
County
County Highway Agency

About this bridge

Quartz Valley Road over Scott River is a concrete continuous tee beam carrying Quartz Valley Road over Scott River in Siskiyou County, California. It was built in 1967, so it is 58 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 329 vehicles a day, roughly 10% of them trucks, projected to reach 435 by 2042. The structure is 303 ft (92.4 m) long and 29 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

Location

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CarriesQuartz Valley Road
CrossesScott River
Location0.3 MI S Scott River RD
RouteCounty Highway 0
CountySiskiyou County
StateCalifornia
Coordinates41.62875, -122.95724
Functional classRural Minor 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30.8 US tons
Inventory rating22.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length303 ft (92.4 m)
Longest span60 ft (18.3 m)
Deck width29 ft (8.7 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic329 (2011)
Projected traffic435 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.3 mi (31 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 Quartz Valley Road over Scott River built?

It was built in 1967, making it 58 years old in 2025.

What condition is Quartz Valley Road over Scott River 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 2024.

How much traffic does Quartz Valley Road over Scott River carry?

About 329 vehicles per day (2011 count), of which roughly 10% are trucks.

How long is Quartz Valley Road over Scott River?

The structure is 303 ft (92.4 m) long with a longest span of 60 ft (18.3 m) and a deck 29 ft wide.

Who owns Quartz Valley Road over Scott River?

It is owned by the County Highway Agency.