US Bridges

State Route 20 over Bear Creek

Fair

Colusa County, California · 03-COL-020-3.28 · Structure no. 15 0086

Built
2009
16 years old
Condition
Fair
inspected March 2021
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
246 ft
3 main spans
Daily traffic
5,400
2013 count
Owner
State
State Highway Agency

About this bridge

State Route 20 over Bear Creek is a prestressed concrete continuous box beam or girders - multiple carrying State Route 20 over Bear Creek in Colusa County, California. It was built in 2009, so it is 16 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 5,400 vehicles a day, roughly 10% of them trucks, projected to reach 7,000 by 2040. The structure is 246 ft (75 m) long and 45 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesState Route 20
CrossesBear Creek
Location03-COL-020-3.28
RouteState Highway 20
Coordinates39.01145, -122.3616
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length246 ft (75 m)
Longest span98 ft (30 m)
Deck width45 ft (13.7 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,400 (2013)
Projected traffic7,000 by 2040
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was State Route 20 over Bear Creek built?

It was built in 2009, making it 16 years old in 2025.

What condition is State Route 20 over Bear 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 March 2021.

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

About 5,400 vehicles per day (2013 count), of which roughly 10% are trucks.

How long is State Route 20 over Bear Creek?

The structure is 246 ft (75 m) long with a longest span of 98 ft (30 m) and a deck 45 ft wide.

Who owns State Route 20 over Bear Creek?

It is owned by the State Highway Agency.