US Bridges

Occidental RD over Atascadero Creek

Fair

Sonoma County, California · 1.12 MI W S.R. 116 · Structure no. 20C0380

Built
1971
54 years old
Condition
Fair
inspected July 2023
Type
Slab
Concrete Continuous
Length
211 ft
8 main spans
Daily traffic
5,100
2009 count
Owner
County
County Highway Agency

About this bridge

Occidental RD over Atascadero Creek is a concrete continuous slab carrying Occidental RD over Atascadero Creek in Sonoma County, California. It was built in 1971, so it is 54 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 5,100 vehicles a day, roughly 1% of them trucks, projected to reach 2,772 by 2041. The structure is 211 ft (64.3 m) long and 40 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesOccidental RD
CrossesAtascadero Creek
Location1.12 MI W S.R. 116
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.42219, -122.8683
Functional classUrban 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to 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 alignment8: Equal to present desirable criteria
Operating rating51.5 US tons
Inventory rating31.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans8
Design loadUnknown
Structure length211 ft (64.3 m)
Longest span28 ft (8.5 m)
Deck width40 ft (12.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,100 (2009)
Projected traffic2,772 by 2041
Trucks1%
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 Occidental RD over Atascadero Creek built?

It was built in 1971, making it 54 years old in 2025.

What condition is Occidental RD over Atascadero 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 July 2023.

How much traffic does Occidental RD over Atascadero Creek carry?

About 5,100 vehicles per day (2009 count), of which roughly 1% are trucks.

How long is Occidental RD over Atascadero Creek?

The structure is 211 ft (64.3 m) long with a longest span of 28 ft (8.5 m) and a deck 40 ft wide.

Who owns Occidental RD over Atascadero Creek?

It is owned by the County Highway Agency.