US Bridges

Quartz Valley Road over Shackleford Creek

Fair

Siskiyou County, California · 3.6 MI S Scott River RD · Structure no. 02C0065

Built
1967
58 years old
Condition
Fair
inspected June 2024
Type
Slab
Concrete Continuous
Length
91 ft
3 main spans
Daily traffic
330
2011 count
Owner
County
County Highway Agency

About this bridge

Quartz Valley Road over Shackleford Creek is a concrete continuous slab carrying Quartz Valley Road over Shackleford Creek 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 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 330 vehicles a day, roughly 5% of them trucks, projected to reach 435 by 2042. The structure is 91 ft (27.7 m) long and 27 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesQuartz Valley Road
CrossesShackleford Creek
Location3.6 MI S Scott River RD
RouteCounty Highway 0
CountySiskiyou County
StateCalifornia
Coordinates41.59396, -122.97421
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.6 US tons
Inventory rating44.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length91 ft (27.7 m)
Longest span34 ft (10.4 m)
Deck width27 ft (8.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic330 (2011)
Projected traffic435 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Shackleford Creek built?

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

What condition is Quartz Valley Road over Shackleford 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 2024.

How much traffic does Quartz Valley Road over Shackleford Creek carry?

About 330 vehicles per day (2011 count), of which roughly 5% are trucks.

How long is Quartz Valley Road over Shackleford Creek?

The structure is 91 ft (27.7 m) long with a longest span of 34 ft (10.4 m) and a deck 27 ft wide.

Who owns Quartz Valley Road over Shackleford Creek?

It is owned by the County Highway Agency.