US Bridges

Road #61 over Colusa Drain

Good

Glenn County, California · 0.1 MI E of RD W · Structure no. 11C0064

Built
1977
48 years old
Condition
Good
inspected February 2024
Type
Slab
Concrete Continuous
Length
59 ft
2 main spans
Daily traffic
859
2018 count
Owner
County
County Highway Agency

About this bridge

Road #61 over Colusa Drain is a concrete continuous slab carrying Road #61 over Colusa Drain in Glenn County, California. It was built in 1977, so it is 48 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 859 vehicles a day, roughly 30% of them trucks, projected to reach 935 by 2042. The structure is 59 ft (18 m) long and 32 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

CarriesRoad #61
CrossesColusa Drain
Location0.1 MI E of RD W
RouteCounty Highway 0
Coordinates39.45755, -122.04203
Functional classRural Major Collector

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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating101.4 US tons
Inventory rating61.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length59 ft (18 m)
Longest span28 ft (8.5 m)
Deck width32 ft (9.9 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic859 (2018)
Projected traffic935 by 2042
Trucks30%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Road #61 over Colusa Drain built?

It was built in 1977, making it 48 years old in 2025.

What condition is Road #61 over Colusa 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 February 2024.

How much traffic does Road #61 over Colusa Drain carry?

About 859 vehicles per day (2018 count), of which roughly 30% are trucks.

How long is Road #61 over Colusa Drain?

The structure is 59 ft (18 m) long with a longest span of 28 ft (8.5 m) and a deck 32 ft wide.

Who owns Road #61 over Colusa Drain?

It is owned by the County Highway Agency.