US Bridges

State Route 20 over Refuge Drain

Good

Colusa County, California · 03-COL-020-28.81 · Structure no. 15 0084

Built
1983
42 years old
Condition
Good
inspected January 2025
Type
Culvert
Concrete Continuous
Length
45 ft
3 main spans
Daily traffic
7,750
2013 count
Owner
State
State Highway Agency

About this bridge

State Route 20 over Refuge Drain is a concrete continuous culvert carrying State Route 20 over Refuge Drain in Colusa County, California. It was built in 1983, so it is 42 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 7,750 vehicles a day, projected to reach 10,338 by 2043. The structure is 45 ft (13.7 m) long and 47 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesState Route 20
CrossesRefuge Drain
Location03-COL-020-28.81
RouteState Highway 20
Coordinates39.19526, -122.04431
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 protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 48 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 rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadUnknown
Structure length45 ft (13.7 m)
Longest span14 ft (4.3 m)
Deck width47 ft (14.3 m)
Roadway width46 ft (14 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,750 (2013)
Projected traffic10,338 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Refuge Drain built?

It was built in 1983, making it 42 years old in 2025.

What condition is State Route 20 over Refuge Drain 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 January 2025.

How much traffic does State Route 20 over Refuge Drain carry?

About 7,750 vehicles per day (2013 count).

How long is State Route 20 over Refuge Drain?

The structure is 45 ft (13.7 m) long with a longest span of 14 ft (4.3 m) and a deck 47 ft wide.

Who owns State Route 20 over Refuge Drain?

It is owned by the State Highway Agency.