US Bridges

Walnut Drive over Glenn-Colusa Canal

Fair

Colusa County, California · 0.2 MI W Zumwalt RD · Structure no. 15C0055

Built
1940
85 years old
Condition
Fair
inspected December 2024
Type
Slab
Concrete Continuous
Length
23 ft
2 main spans
Daily traffic
650
2015 count
Owner
County
County Highway Agency

About this bridge

Walnut Drive over Glenn-Colusa Canal is a concrete continuous slab carrying Walnut Drive over Glenn-Colusa Canal in Colusa County, California. It was built in 1940, so it is 85 years old, older 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 650 vehicles a day, roughly 10% of them trucks, projected to reach 1,363 by 2044. The structure is 23 ft (7 m) long and 24 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesWalnut Drive
CrossesGlenn-Colusa Canal
Location0.2 MI W Zumwalt RD
RouteCounty Highway 0
CountyColusa County
StateCalifornia
Coordinates39.11955, -122.15618
Functional classRural Local

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating29.7 US tons
Inventory rating17.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length23 ft (7 m)
Longest span11 ft (3.4 m)
Deck width24 ft (7.2 m)
Roadway width22 ft (6.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic650 (2015)
Projected traffic1,363 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 Walnut Drive over Glenn-Colusa Canal built?

It was built in 1940, making it 85 years old in 2025.

What condition is Walnut Drive over Glenn-Colusa Canal 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 December 2024.

How much traffic does Walnut Drive over Glenn-Colusa Canal carry?

About 650 vehicles per day (2015 count), of which roughly 10% are trucks.

How long is Walnut Drive over Glenn-Colusa Canal?

The structure is 23 ft (7 m) long with a longest span of 11 ft (3.4 m) and a deck 24 ft wide.

Who owns Walnut Drive over Glenn-Colusa Canal?

It is owned by the County Highway Agency.