US Bridges

State Route 1 over Cheney Gulch

Fair

Sonoma County, California · 04-SON-001-9.16 · Structure no. 20 0189

Built
1956
69 years old
Condition
Fair
inspected June 2024
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
6,300
2016 count
Owner
State
State Highway Agency

About this bridge

State Route 1 over Cheney Gulch is a concrete continuous culvert carrying State Route 1 over Cheney Gulch in Sonoma County, California. It was built in 1956, so it is 69 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 6,300 vehicles a day, roughly 6% of them trucks, projected to reach 8,123 by 2046. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 24.9 mi (40 km).

Location

Open in Google Maps
CarriesState Route 1
CrossesCheney Gulch
Location04-SON-001-9.16
RouteState Highway 1
CountySonoma County
StateCalifornia
Coordinates38.31983, -123.03392
Functional classRural Minor Arterial

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,300 (2016)
Projected traffic8,123 by 2046
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.9 mi (40 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 State Route 1 over Cheney Gulch built?

It was built in 1956, making it 69 years old in 2025.

What condition is State Route 1 over Cheney Gulch 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 June 2024.

How much traffic does State Route 1 over Cheney Gulch carry?

About 6,300 vehicles per day (2016 count), of which roughly 6% are trucks.

How long is State Route 1 over Cheney Gulch?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m).

Who owns State Route 1 over Cheney Gulch?

It is owned by the State Highway Agency.