US Bridges

Tamarack Road over Old Cow Creek

Fair

Shasta County, California · 0.5 MI E of Lumber RD · Structure no. 06C0385

Built
2001
24 years old
Condition
Fair
inspected September 2024
Type
Truss - Thru
Steel
Length
50 ft
1 main span
Daily traffic
20
2012 count
Owner
County
County Highway Agency

About this bridge

Tamarack Road over Old Cow Creek is a steel truss - thru carrying Tamarack Road over Old Cow Creek in Shasta County, California. It was built in 2001, so it is 24 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 20 vehicles a day, roughly 5% of them trucks, projected to reach 41 by 2045. The structure is 50 ft (15.1 m) long and 12 ft wide. If it were closed, the detour would be 24.9 mi (40 km).

Location

Open in Google Maps
CarriesTamarack Road
CrossesOld Cow Creek
Location0.5 MI E of Lumber RD
RouteCounty Highway 0
CountyShasta County
StateCalifornia
Coordinates40.68791, -121.73977
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.5 US tons
Inventory rating19.6 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length50 ft (15.1 m)
Longest span49 ft (14.9 m)
Deck width12 ft (3.7 m)
Roadway width10 ft (3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2012)
Projected traffic41 by 2045
Trucks5%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.9 mi (40 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Tamarack Road over Old Cow Creek built?

It was built in 2001, making it 24 years old in 2025.

What condition is Tamarack Road over Old Cow 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 2024.

How much traffic does Tamarack Road over Old Cow Creek carry?

About 20 vehicles per day (2012 count), of which roughly 5% are trucks.

How long is Tamarack Road over Old Cow Creek?

The structure is 50 ft (15.1 m) long with a longest span of 49 ft (14.9 m) and a deck 12 ft wide.

Who owns Tamarack Road over Old Cow Creek?

It is owned by the County Highway Agency.