US Bridges

State Route 20 over Clover Creek

Good

Lake County, California · 01-LAK-020-8.89 · Structure no. 14 0003

Built
1975
50 years old
Condition
Good
inspected October 2024
Type
Slab
Concrete Continuous
Length
60 ft
3 main spans
Daily traffic
8,000
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 20 over Clover Creek is a concrete continuous slab carrying State Route 20 over Clover Creek in Lake County, California. It was built in 1975, so it is 50 years old, younger 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 8,000 vehicles a day, roughly 10% of them trucks, projected to reach 11,984 by 2042. The structure is 60 ft (18.3 m) long and 68 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesState Route 20
CrossesClover Creek
Location01-LAK-020-8.89
RouteState Highway 20
Coordinates39.16212, -122.91084
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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating81 US tons
Inventory rating48.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length60 ft (18.3 m)
Longest span20 ft (6.1 m)
Deck width68 ft (20.6 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,000 (2009)
Projected traffic11,984 by 2042
Trucks10%
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 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 Clover Creek built?

It was built in 1975, making it 50 years old in 2025.

What condition is State Route 20 over Clover 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 October 2024.

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

About 8,000 vehicles per day (2009 count), of which roughly 10% are trucks.

How long is State Route 20 over Clover Creek?

The structure is 60 ft (18.3 m) long with a longest span of 20 ft (6.1 m) and a deck 68 ft wide.

Who owns State Route 20 over Clover Creek?

It is owned by the State Highway Agency.