US Bridges

Skillman Lane over Wilson Creek

Fair

Sonoma County, California · East of Thompson Lane · Structure no. 20C0298

Built
1960
65 years old
Condition
Fair
inspected February 2025
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
1,600
2012 count
Owner
County
County Highway Agency

About this bridge

Skillman Lane over Wilson Creek is a concrete continuous culvert carrying Skillman Lane over Wilson Creek in Sonoma County, California. It was built in 1960, so it is 65 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 1,600 vehicles a day, roughly 3% of them trucks, projected to reach 2,300 by 2043. The structure is 21 ft (6.3 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSkillman Lane
CrossesWilson Creek
LocationEast of Thompson Lane
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.256, -122.68043
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length21 ft (6.3 m)
Longest span10 ft (3 m)
Deck width33 ft (10.2 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,600 (2012)
Projected traffic2,300 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Skillman Lane over Wilson Creek built?

It was built in 1960, making it 65 years old in 2025.

What condition is Skillman Lane over Wilson 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 February 2025.

How much traffic does Skillman Lane over Wilson Creek carry?

About 1,600 vehicles per day (2012 count), of which roughly 3% are trucks.

How long is Skillman Lane over Wilson Creek?

The structure is 21 ft (6.3 m) long with a longest span of 10 ft (3 m) and a deck 33 ft wide.

Who owns Skillman Lane over Wilson Creek?

It is owned by the County Highway Agency.