US Bridges

State Route 96 over Thompson Creek

Poor

Siskiyou County, California · 02-SIS-096-52.48 · Structure no. 02 0068

Built
1952
73 years old, rebuilt 2019
Condition
Poor
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
125 ft
3 main spans
Daily traffic
615
2015 count
Owner
State
State Highway Agency

About this bridge

State Route 96 over Thompson Creek is a steel stringer/multi-beam or girder carrying State Route 96 over Thompson Creek in Siskiyou County, California. It was built in 1952 and reconstructed in 2019, 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 615 vehicles a day, roughly 20% of them trucks, projected to reach 735 by 2046. The structure is 125 ft (38.1 m) long and 36 ft wide. If it were closed, the detour would be 67.7 mi (109 km).

CarriesState Route 96
CrossesThompson Creek
Location02-SIS-096-52.48
RouteState Highway 96
Coordinates41.86338, -123.31051
Functional classRural Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 rating59.6 US tons
Inventory rating35.7 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length125 ft (38.1 m)
Longest span60 ft (18.3 m)
Deck width36 ft (11 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic615 (2015)
Projected traffic735 by 2046
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed67.7 mi (109 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 Thompson Creek built?

It was built in 1952, making it 73 years old in 2025. It was reconstructed in 2019.

What condition is State Route 96 over Thompson Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2024.

How much traffic does State Route 96 over Thompson Creek carry?

About 615 vehicles per day (2015 count), of which roughly 20% are trucks.

How long is State Route 96 over Thompson Creek?

The structure is 125 ft (38.1 m) long with a longest span of 60 ft (18.3 m) and a deck 36 ft wide.

Who owns State Route 96 over Thompson Creek?

It is owned by the State Highway Agency.