US Bridges

State Route 96 over Oak Flat Creek

Good

Siskiyou County, California · 02-SIS-096-34.35 · Structure no. 02 0053

Built
1952
73 years old
Condition
Good
inspected September 2024
Type
Slab
Concrete Continuous
Length
73 ft
3 main spans
Daily traffic
400
2015 count
Owner
State
State Highway Agency

About this bridge

State Route 96 over Oak Flat Creek is a concrete continuous slab carrying State Route 96 over Oak Flat Creek in Siskiyou County, California. It was built in 1952, so it is 73 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 400 vehicles a day, roughly 10% of them trucks, projected to reach 918 by 2046. The structure is 73 ft (22.2 m) long and 29 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesState Route 96
CrossesOak Flat Creek
Location02-SIS-096-34.35
RouteState Highway 96
Coordinates41.72988, -123.43562
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.2 US tons
Inventory rating32.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length73 ft (22.2 m)
Longest span29 ft (8.8 m)
Deck width29 ft (8.7 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (2015)
Projected traffic918 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 96 over Oak Flat Creek built?

It was built in 1952, making it 73 years old in 2025.

What condition is State Route 96 over Oak Flat Creek 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 September 2024.

How much traffic does State Route 96 over Oak Flat Creek carry?

About 400 vehicles per day (2015 count), of which roughly 10% are trucks.

How long is State Route 96 over Oak Flat Creek?

The structure is 73 ft (22.2 m) long with a longest span of 29 ft (8.8 m) and a deck 29 ft wide.

Who owns State Route 96 over Oak Flat Creek?

It is owned by the State Highway Agency.