US Bridges

Occidental RD over Laguna De Santa Rosa

Fair

Sonoma County, California · 1 MI East of SR 116 · Structure no. 20C0249

Built
1990
35 years old
Condition
Fair
inspected October 2023
Type
Slab
Concrete Continuous
Length
240 ft
7 main spans
Daily traffic
22,900
2015 count
Owner
County
County Highway Agency

About this bridge

Occidental RD over Laguna De Santa Rosa is a concrete continuous slab carrying Occidental RD over Laguna De Santa Rosa in Sonoma County, California. It was built in 1990, so it is 35 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 22,900 vehicles a day, roughly 2% of them trucks, projected to reach 51,520 by 2040. The structure is 240 ft (73.2 m) long and 41 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesOccidental RD
CrossesLaguna De Santa Rosa
Location1 MI East of SR 116
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.42592, -122.83013
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20 + Mod
Structure length240 ft (73.2 m)
Longest span37 ft (11.3 m)
Deck width41 ft (12.4 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,900 (2015)
Projected traffic51,520 by 2040
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 Laguna De Santa Rosa built?

It was built in 1990, making it 35 years old in 2025.

What condition is Occidental RD over Laguna De Santa Rosa 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 October 2023.

How much traffic does Occidental RD over Laguna De Santa Rosa carry?

About 22,900 vehicles per day (2015 count), of which roughly 2% are trucks.

How long is Occidental RD over Laguna De Santa Rosa?

The structure is 240 ft (73.2 m) long with a longest span of 37 ft (11.3 m) and a deck 41 ft wide.

Who owns Occidental RD over Laguna De Santa Rosa?

It is owned by the County Highway Agency.