US Bridges

Island Road over Scott River Overflow

Fair

Siskiyou County, California · 0.75 MI W of E Road · Structure no. 02C0079

Built
1989
36 years old
Condition
Fair
inspected June 2024
Type
Slab
Concrete Continuous
Length
43 ft
2 main spans
Daily traffic
35
2011 count
Owner
County
County Highway Agency

About this bridge

Island Road over Scott River Overflow is a concrete continuous slab carrying Island Road over Scott River Overflow in Siskiyou County, California. It was built in 1989, so it is 36 years old, younger 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 35 vehicles a day, roughly 12% of them trucks, projected to reach 110 by 2042. The structure is 43 ft (13.1 m) long and 25 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesIsland Road
CrossesScott River Overflow
Location0.75 MI W of E Road
RouteCounty Highway 0
CountySiskiyou County
StateCalifornia
Coordinates41.57036, -122.85035
Functional classRural Local

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length43 ft (13.1 m)
Longest span20 ft (6.1 m)
Deck width25 ft (7.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (2011)
Projected traffic110 by 2042
Trucks12%
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 Island Road over Scott River Overflow built?

It was built in 1989, making it 36 years old in 2025.

What condition is Island Road over Scott River Overflow 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 Island Road over Scott River Overflow carry?

About 35 vehicles per day (2011 count), of which roughly 12% are trucks.

How long is Island Road over Scott River Overflow?

The structure is 43 ft (13.1 m) long with a longest span of 20 ft (6.1 m) and a deck 25 ft wide.

Who owns Island Road over Scott River Overflow?

It is owned by the County Highway Agency.