US Bridges

Windsor RD over Branch Windsor Creek

Fair

Sonoma County, California · 0.3 MI N of Silk RD · Structure no. 20C0342

Built
1946
79 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
31 ft
1 main span
Daily traffic
1,500
2015 count
Owner
County
County Highway Agency

About this bridge

Windsor RD over Branch Windsor Creek is a steel stringer/multi-beam or girder carrying Windsor RD over Branch Windsor Creek in Sonoma County, California. It was built in 1946, so it is 79 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 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 1,500 vehicles a day, roughly 4% of them trucks, projected to reach 1,957 by 2046. The structure is 31 ft (9.4 m) long and 26 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesWindsor RD
CrossesBranch Windsor Creek
Location0.3 MI N of Silk RD
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.5179, -122.82137
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.2 US tons
Inventory rating26.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length31 ft (9.4 m)
Longest span30 ft (9.1 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,500 (2015)
Projected traffic1,957 by 2046
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Windsor RD over Branch Windsor Creek built?

It was built in 1946, making it 79 years old in 2025.

What condition is Windsor RD over Branch Windsor 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 October 2024.

How much traffic does Windsor RD over Branch Windsor Creek carry?

About 1,500 vehicles per day (2015 count), of which roughly 4% are trucks.

How long is Windsor RD over Branch Windsor Creek?

The structure is 31 ft (9.4 m) long with a longest span of 30 ft (9.1 m) and a deck 26 ft wide.

Who owns Windsor RD over Branch Windsor Creek?

It is owned by the County Highway Agency.