US Bridges

Road D over Glenn-Colusa Canal

Fair

Glenn County, California · 0.6 MI N/O Road 68 · Structure no. 11C0002

Built
1962
63 years old
Condition
Fair
inspected January 2025
Type
Slab
Concrete Continuous
Length
78 ft
4 main spans
Daily traffic
268
2011 count
Owner
County
County Highway Agency

About this bridge

Road D over Glenn-Colusa Canal is a concrete continuous slab carrying Road D over Glenn-Colusa Canal in Glenn County, California. It was built in 1962, so it is 63 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 268 vehicles a day, roughly 3% of them trucks, projected to reach 309 by 2043. The structure is 78 ft (23.8 m) long and 29 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesRoad D
CrossesGlenn-Colusa Canal
Location0.6 MI N/O Road 68
RouteCounty Highway 0
CountyGlenn County
StateCalifornia
Coordinates39.41499, -122.2484
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to 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 rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadUnknown
Structure length78 ft (23.8 m)
Longest span18 ft (5.5 m)
Deck width29 ft (8.7 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic268 (2011)
Projected traffic309 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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 D over Glenn-Colusa Canal built?

It was built in 1962, making it 63 years old in 2025.

What condition is Road D 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 January 2025.

How much traffic does Road D over Glenn-Colusa Canal carry?

About 268 vehicles per day (2011 count), of which roughly 3% are trucks.

How long is Road D over Glenn-Colusa Canal?

The structure is 78 ft (23.8 m) long with a longest span of 18 ft (5.5 m) and a deck 29 ft wide.

Who owns Road D over Glenn-Colusa Canal?

It is owned by the County Highway Agency.