US Bridges

Willowside RD over Santa Rosa Fl Con Chan

Fair

Sonoma County, California · 1 MI S of Guerneville RD · Structure no. 20C0245

Built
1965
60 years old
Condition
Fair
inspected May 2023
Type
Slab
Concrete Continuous
Length
182 ft
6 main spans
Daily traffic
832
2015 count
Owner
County
County Highway Agency

About this bridge

Willowside RD over Santa Rosa Fl Con Chan is a concrete continuous slab carrying Willowside RD over Santa Rosa Fl Con Chan in Sonoma County, California. It was built in 1965, so it is 60 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 832 vehicles a day, roughly 1% of them trucks, projected to reach 3,031 by 2040. The structure is 182 ft (55.5 m) long and 32 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesWillowside RD
CrossesSanta Rosa Fl Con Chan
Location1 MI S of Guerneville RD
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.44503, -122.80672
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.7 US tons
Inventory rating30.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length182 ft (55.5 m)
Longest span30 ft (9.1 m)
Deck width32 ft (9.9 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic832 (2015)
Projected traffic3,031 by 2040
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Willowside RD over Santa Rosa Fl Con Chan built?

It was built in 1965, making it 60 years old in 2025.

What condition is Willowside RD over Santa Rosa Fl Con Chan 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 May 2023.

How much traffic does Willowside RD over Santa Rosa Fl Con Chan carry?

About 832 vehicles per day (2015 count), of which roughly 1% are trucks.

How long is Willowside RD over Santa Rosa Fl Con Chan?

The structure is 182 ft (55.5 m) long with a longest span of 30 ft (9.1 m) and a deck 32 ft wide.

Who owns Willowside RD over Santa Rosa Fl Con Chan?

It is owned by the County Highway Agency.