US Bridges

State Route 20 over Cold Creek

Good

Mendocino County, California · 01-MEN-020-R39.65 · Structure no. 10 0043

Built
1967
58 years old
Condition
Good
inspected June 2022
Type
Slab
Concrete Continuous
Length
106 ft
3 main spans
Daily traffic
10,400
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 20 over Cold Creek is a concrete continuous slab carrying State Route 20 over Cold Creek in Mendocino County, California. It was built in 1967, so it is 58 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 10,400 vehicles a day, roughly 10% of them trucks, projected to reach 19,887 by 2040. The structure is 106 ft (32.3 m) long and 42 ft wide. If it were closed, the detour would be 54.1 mi (87 km).

CarriesState Route 20
CrossesCold Creek
Location01-MEN-020-R39.65
RouteState Highway 20
Coordinates39.23217, -123.10235
Functional classRural Principal Arterial - Other

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 inspectionJune 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.8 US tons
Inventory rating46.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length106 ft (32.3 m)
Longest span42 ft (12.8 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,400 (2009)
Projected traffic19,887 by 2040
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed54.1 mi (87 km)
TollOn a free road
National Highway SystemYes

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 20 over Cold Creek built?

It was built in 1967, making it 58 years old in 2025.

What condition is State Route 20 over Cold Creek 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 June 2022.

How much traffic does State Route 20 over Cold Creek carry?

About 10,400 vehicles per day (2009 count), of which roughly 10% are trucks.

How long is State Route 20 over Cold Creek?

The structure is 106 ft (32.3 m) long with a longest span of 42 ft (12.8 m) and a deck 42 ft wide.

Who owns State Route 20 over Cold Creek?

It is owned by the State Highway Agency.