US Bridges

State Route 20 over Phipps Creek

Fair

Lake County, California · 01-LAK-020-36.08 · Structure no. 14 0082

Built
1993
32 years old
Condition
Fair
inspected October 2024
Type
Culvert
Concrete
Length
23 ft
3 main spans
Daily traffic
6,300
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 20 over Phipps Creek is a concrete culvert carrying State Route 20 over Phipps Creek in Lake County, California. It was built in 1993, so it is 32 years old, younger 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 6,300 vehicles a day, roughly 13% of them trucks, projected to reach 10,974 by 2044. The structure is 23 ft (7 m) long. If it were closed, the detour would be 62.1 mi (100 km).

CarriesState Route 20
CrossesPhipps Creek
Location01-LAK-020-36.08
RouteState Highway 20
Coordinates38.99744, -122.55533
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
Channel and channel protection9 ExcellentNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20 + Mod
Structure length23 ft (7 m)
Longest span7 ft (2.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,300 (2009)
Projected traffic10,974 by 2044
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed62.1 mi (100 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 Phipps Creek built?

It was built in 1993, making it 32 years old in 2025.

What condition is State Route 20 over Phipps 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 October 2024.

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

About 6,300 vehicles per day (2009 count), of which roughly 13% are trucks.

How long is State Route 20 over Phipps Creek?

The structure is 23 ft (7 m) long with a longest span of 7 ft (2.2 m).

Who owns State Route 20 over Phipps Creek?

It is owned by the State Highway Agency.