US Bridges

Copco Road over Klamath River

Good

Siskiyou County, California · Ager Beswick Road · Structure no. 02C0039

Built
1988
37 years old
Condition
Good
inspected August 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
203 ft
2 main spans
Daily traffic
133
2011 count
Owner
County
County Highway Agency

About this bridge

Copco Road over Klamath River is a prestressed concrete continuous box beam or girders - multiple carrying Copco Road over Klamath River in Siskiyou County, California. It was built in 1988, so it is 37 years old, younger 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 133 vehicles a day, roughly 2% of them trucks, projected to reach 199 by 2046. The structure is 203 ft (61.9 m) long and 25 ft wide. If it were closed, the detour would be 28 mi (45 km).

CarriesCopco Road
CrossesKlamath River
LocationAger Beswick Road
RouteCounty Highway 0
Coordinates41.9638, -122.26151
Functional classRural Minor Collector

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 protection7 GoodSome minor problems.
Last inspectionAugust 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating91.8 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length203 ft (61.9 m)
Longest span100 ft (30.5 m)
Deck width25 ft (7.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic133 (2011)
Projected traffic199 by 2046
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed28 mi (45 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 Copco Road over Klamath River built?

It was built in 1988, making it 37 years old in 2025.

What condition is Copco Road over Klamath River 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 August 2024.

How much traffic does Copco Road over Klamath River carry?

About 133 vehicles per day (2011 count), of which roughly 2% are trucks.

How long is Copco Road over Klamath River?

The structure is 203 ft (61.9 m) long with a longest span of 100 ft (30.5 m) and a deck 25 ft wide.

Who owns Copco Road over Klamath River?

It is owned by the County Highway Agency.