US Bridges

State Route 20 over Bear Creek Tributary

Good

Colusa County, California · 03-COL-020-3.40 · Structure no. 15 0085

Built
2009
16 years old
Condition
Good
inspected March 2023
Type
Culvert
Concrete
Length
29 ft
2 main spans
Daily traffic
4,950
2015 count
Owner
State
State Highway Agency

About this bridge

State Route 20 over Bear Creek Tributary is a concrete culvert carrying State Route 20 over Bear Creek Tributary 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 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 4,950 vehicles a day, roughly 11% of them trucks, projected to reach 7,189 by 2045. The structure is 29 ft (8.8 m) long. If it were closed, the detour would be 123.7 mi (199 km).

CarriesState Route 20
CrossesBear Creek Tributary
Location03-COL-020-3.40
RouteState Highway 20
Coordinates39.01276, -122.35902
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
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
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 spans2
Design loadUnknown
Structure length29 ft (8.8 m)
Longest span13 ft (4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,950 (2015)
Projected traffic7,189 by 2045
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
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 Tributary built?

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

What condition is State Route 20 over Bear Creek Tributary 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 March 2023.

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

About 4,950 vehicles per day (2015 count), of which roughly 11% are trucks.

How long is State Route 20 over Bear Creek Tributary?

The structure is 29 ft (8.8 m) long with a longest span of 13 ft (4 m).

Who owns State Route 20 over Bear Creek Tributary?

It is owned by the State Highway Agency.