US Bridges

Capay RD over Sour Grass Creek

Fair

Tehama County, California · 3.5 MI E of RD 99 W · Structure no. 08C0163

Built
1919
106 years old
Condition
Fair
inspected April 2023
Type
Slab
Concrete Continuous
Length
48 ft
3 main spans
Daily traffic
982
2008 count
Owner
County
County Highway Agency

About this bridge

Capay RD over Sour Grass Creek is a concrete continuous slab carrying Capay RD over Sour Grass Creek in Tehama County, California. It was built in 1919, so it is 106 years old, older 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 982 vehicles a day, roughly 5% of them trucks, projected to reach 981 by 2041. The structure is 48 ft (14.6 m) long and 20 ft wide. If it were closed, the detour would be 24.2 mi (39 km).

CarriesCapay RD
CrossesSour Grass Creek
Location3.5 MI E of RD 99 W
RouteCounty Highway 0
Coordinates39.84021, -122.14633
Functional classRural Major Collector

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
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 alignment7: Better than present minimum criteria
Operating rating42.1 US tons
Inventory rating25.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length48 ft (14.6 m)
Longest span17 ft (5.2 m)
Deck width20 ft (6.1 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic982 (2008)
Projected traffic981 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.2 mi (39 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 Capay RD over Sour Grass Creek built?

It was built in 1919, making it 106 years old in 2025.

What condition is Capay RD over Sour Grass 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 April 2023.

How much traffic does Capay RD over Sour Grass Creek carry?

About 982 vehicles per day (2008 count), of which roughly 5% are trucks.

How long is Capay RD over Sour Grass Creek?

The structure is 48 ft (14.6 m) long with a longest span of 17 ft (5.2 m) and a deck 20 ft wide.

Who owns Capay RD over Sour Grass Creek?

It is owned by the County Highway Agency.