US Bridges

State Route 3 over Patterson Creek

Fair

Siskiyou County, California · 02-SIS-003-24.26 · Structure no. 02 0038

Built
1962
63 years old
Condition
Fair
inspected September 2023
Type
Tee Beam
Concrete Continuous
Length
74 ft
2 main spans
Daily traffic
2,825
2015 count
Owner
State
State Highway Agency

About this bridge

State Route 3 over Patterson Creek is a concrete continuous tee beam carrying State Route 3 over Patterson Creek in Siskiyou County, California. It was built in 1962, so it is 63 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 2,825 vehicles a day, projected to reach 3,594 by 2040. The structure is 74 ft (22.6 m) long and 35 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesState Route 3
CrossesPatterson Creek
Location02-SIS-003-24.26
RouteState Highway 3
CountySiskiyou County
StateCalifornia
Coordinates41.50254, -122.90652
Functional classRural Minor Arterial

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 inspectionSeptember 2023
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.9 US tons
Inventory rating28.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length74 ft (22.6 m)
Longest span35 ft (10.8 m)
Deck width35 ft (10.6 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,825 (2015)
Projected traffic3,594 by 2040
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 3 over Patterson Creek built?

It was built in 1962, making it 63 years old in 2025.

What condition is State Route 3 over Patterson 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 September 2023.

How much traffic does State Route 3 over Patterson Creek carry?

About 2,825 vehicles per day (2015 count).

How long is State Route 3 over Patterson Creek?

The structure is 74 ft (22.6 m) long with a longest span of 35 ft (10.8 m) and a deck 35 ft wide.

Who owns State Route 3 over Patterson Creek?

It is owned by the State Highway Agency.