US Bridges

State Route 1 over Russian Gulch

Fair

Mendocino County, California · 01-MEN-001-52.64 · Structure no. 10 0151

Built
1939
86 years old
Condition
Fair
inspected August 2024
Type
Arch - Deck
Concrete
Length
527 ft
1 main span
Daily traffic
9,900
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 1 over Russian Gulch is a concrete arch - deck carrying State Route 1 over Russian Gulch in Mendocino County, California. It was built in 1939, so it is 86 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 9,900 vehicles a day, roughly 7% of them trucks, projected to reach 12,678 by 2042. The structure is 527 ft (160.6 m) long and 31 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesState Route 1
CrossesRussian Gulch
Location01-MEN-001-52.64
RouteState Highway 1
CountyMendocino County
StateCalifornia
Coordinates39.32853, -123.8044
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.8 US tons
Inventory rating37.1 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1 (+14 approach)
Design loadHS 20
Structure length527 ft (160.6 m)
Longest span240 ft (73.2 m)
Deck width31 ft (9.6 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,900 (2009)
Projected traffic12,678 by 2042
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible 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 Russian Gulch built?

It was built in 1939, making it 86 years old in 2025.

What condition is State Route 1 over Russian 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 August 2024.

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

About 9,900 vehicles per day (2009 count), of which roughly 7% are trucks.

How long is State Route 1 over Russian Gulch?

The structure is 527 ft (160.6 m) long with a longest span of 240 ft (73.2 m) and a deck 31 ft wide.

Who owns State Route 1 over Russian Gulch?

It is owned by the State Highway Agency.