US Bridges

Old Alturas RD over Stillwater Creek

Fair

Shasta County, California · 0.1 MI E Oregon Trail RD · Structure no. 06C0258

Built
1979
46 years old
Condition
Fair
inspected June 2023
Type
Slab
Concrete Continuous
Length
133 ft
2 main spans
Daily traffic
4,130
2012 count
Owner
County
County Highway Agency

About this bridge

Old Alturas RD over Stillwater Creek is a concrete continuous slab carrying Old Alturas RD over Stillwater Creek in Shasta County, California. It was built in 1979, so it is 46 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 5 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 4,130 vehicles a day, roughly 5% of them trucks, projected to reach 6,126 by 2043. The structure is 133 ft (40.5 m) long and 29 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesOld Alturas RD
CrossesStillwater Creek
Location0.1 MI E Oregon Trail RD
RouteCounty Highway 0
CountyShasta County
StateCalifornia
Coordinates40.58895, -122.30536
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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating57.1 US tons
Inventory rating34.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length133 ft (40.5 m)
Longest span65 ft (19.8 m)
Deck width29 ft (8.7 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,130 (2012)
Projected traffic6,126 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 Old Alturas RD over Stillwater Creek built?

It was built in 1979, making it 46 years old in 2025.

What condition is Old Alturas RD over Stillwater 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 June 2023.

How much traffic does Old Alturas RD over Stillwater Creek carry?

About 4,130 vehicles per day (2012 count), of which roughly 5% are trucks.

How long is Old Alturas RD over Stillwater Creek?

The structure is 133 ft (40.5 m) long with a longest span of 65 ft (19.8 m) and a deck 29 ft wide.

Who owns Old Alturas RD over Stillwater Creek?

It is owned by the County Highway Agency.