US Bridges

State Route 20 over Cold Creek

Fair

Mendocino County, California · 01-MEN-020-R37.90 · Structure no. 10 0040

Built
1967
58 years old
Condition
Fair
inspected June 2024
Type
Tee Beam
Concrete Continuous
Length
153 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 tee beam 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 fair condition with a lowest component rating of 5 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 10,400 vehicles a day, roughly 10% of them trucks, projected to reach 21,219 by 2042. The structure is 153 ft (46.6 m) long and 91 ft wide. If it were closed, the detour would be 57.8 mi (93 km).

CarriesState Route 20
CrossesCold Creek
Location01-MEN-020-R37.90
RouteState Highway 20
Coordinates39.24588, -123.12866
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.6 US tons
Inventory rating41.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length153 ft (46.6 m)
Longest span60 ft (18.3 m)
Deck width91 ft (27.7 m)
Roadway width89 ft (27.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,400 (2009)
Projected traffic21,219 by 2042
Trucks10%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed57.8 mi (93 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 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 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 153 ft (46.6 m) long with a longest span of 60 ft (18.3 m) and a deck 91 ft wide.

Who owns State Route 20 over Cold Creek?

It is owned by the State Highway Agency.