US Bridges

State Route 3 over Scott River

Fair

Siskiyou County, California · 02-SIS-003-31.68 · Structure no. 02 0057

Built
1956
69 years old, rebuilt 1986
Condition
Fair
inspected September 2024
Type
Tee Beam
Prestressed Concrete
Length
302 ft
6 main spans
Daily traffic
2,750
2015 count
Owner
State
State Highway Agency

About this bridge

State Route 3 over Scott River is a prestressed concrete tee beam carrying State Route 3 over Scott River in Siskiyou County, California. It was built in 1956 and reconstructed in 1986, so it is 69 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 2,750 vehicles a day, roughly 4% of them trucks, projected to reach 3,113 by 2042. The structure is 302 ft (92 m) long and 36 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesState Route 3
CrossesScott River
Location02-SIS-003-31.68
RouteState Highway 3
Coordinates41.59519, -122.85188
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
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 rating86.8 US tons
Inventory rating52.1 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length302 ft (92 m)
Longest span50 ft (15.2 m)
Deck width36 ft (11 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,750 (2015)
Projected traffic3,113 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Scott River built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 1986.

What condition is State Route 3 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 September 2024.

How much traffic does State Route 3 over Scott River carry?

About 2,750 vehicles per day (2015 count), of which roughly 4% are trucks.

How long is State Route 3 over Scott River?

The structure is 302 ft (92 m) long with a longest span of 50 ft (15.2 m) and a deck 36 ft wide.

Who owns State Route 3 over Scott River?

It is owned by the State Highway Agency.