US Bridges

State Route 1 over South Fork Cottoneva Crk

Good

Mendocino County, California · 01-MEN-001-87.82 · Structure no. 10 0142

Built
1958
67 years old
Condition
Good
inspected September 2023
Type
Slab
Concrete Continuous
Length
86 ft
3 main spans
Daily traffic
1,185
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 1 over South Fork Cottoneva Crk is a concrete continuous slab carrying State Route 1 over South Fork Cottoneva Crk in Mendocino County, California. It was built in 1958, so it is 67 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,185 vehicles a day, roughly 10% of them trucks, projected to reach 1,020 by 2043. The structure is 86 ft (26.2 m) long and 36 ft wide. If it were closed, the detour would be 52.8 mi (85 km).

Location

Open in Google Maps
CarriesState Route 1
CrossesSouth Fork Cottoneva Crk
Location01-MEN-001-87.82
RouteState Highway 1
CountyMendocino County
StateCalifornia
Coordinates39.73834, -123.81674
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length86 ft (26.2 m)
Longest span28 ft (8.5 m)
Deck width36 ft (11.1 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,185 (2009)
Projected traffic1,020 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed52.8 mi (85 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 South Fork Cottoneva Crk built?

It was built in 1958, making it 67 years old in 2025.

What condition is State Route 1 over South Fork Cottoneva Crk in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does State Route 1 over South Fork Cottoneva Crk carry?

About 1,185 vehicles per day (2009 count), of which roughly 10% are trucks.

How long is State Route 1 over South Fork Cottoneva Crk?

The structure is 86 ft (26.2 m) long with a longest span of 28 ft (8.5 m) and a deck 36 ft wide.

Who owns State Route 1 over South Fork Cottoneva Crk?

It is owned by the State Highway Agency.