US Bridges

Copco Road over Cottonwood Creek

Good

Siskiyou County, California · 0.9 MI East of I-5 · Structure no. 02C0257

Built
1980
45 years old
Condition
Good
inspected August 2022
Type
Box Beam or Girders - Multiple
Concrete
Length
90 ft
1 main span
Daily traffic
390
2020 count
Owner
County
County Highway Agency

About this bridge

Copco Road over Cottonwood Creek is a concrete box beam or girders - multiple carrying Copco Road over Cottonwood Creek in Siskiyou County, California. It was built in 1980, so it is 45 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 390 vehicles a day, roughly 12% of them trucks, projected to reach 1,396 by 2041. The structure is 90 ft (27.4 m) long and 33 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesCopco Road
CrossesCottonwood Creek
Location0.9 MI East of I-5
RouteCounty Highway 0
CountySiskiyou County
StateCalifornia
Coordinates41.89763, -122.54735
Functional classRural Major 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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110 US tons
Inventory rating94.2 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length90 ft (27.4 m)
Longest span89 ft (27.1 m)
Deck width33 ft (10 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic390 (2020)
Projected traffic1,396 by 2041
Trucks12%
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

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 Cottonwood Creek built?

It was built in 1980, making it 45 years old in 2025.

What condition is Copco Road over Cottonwood Creek 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 2022.

How much traffic does Copco Road over Cottonwood Creek carry?

About 390 vehicles per day (2020 count), of which roughly 12% are trucks.

How long is Copco Road over Cottonwood Creek?

The structure is 90 ft (27.4 m) long with a longest span of 89 ft (27.1 m) and a deck 33 ft wide.

Who owns Copco Road over Cottonwood Creek?

It is owned by the County Highway Agency.