US Bridges

County RD P over Glenn-Colusa Canal

Fair

Glenn County, California · 2.1 MI N of S.H. 162 · Structure no. 11C0009

Built
1940
85 years old, rebuilt 1961
Condition
Fair
inspected January 2025
Type
Slab
Concrete Continuous
Length
76 ft
6 main spans
Daily traffic
381
2009 count
Owner
County
County Highway Agency

About this bridge

County RD P over Glenn-Colusa Canal is a concrete continuous slab carrying County RD P over Glenn-Colusa Canal in Glenn County, California. It was built in 1940 and reconstructed in 1961, 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 5 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 381 vehicles a day, roughly 20% of them trucks, projected to reach 536 by 2043. The structure is 76 ft (23.2 m) long and 28 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesCounty RD P
CrossesGlenn-Colusa Canal
Location2.1 MI N of S.H. 162
RouteCounty Highway 0
CountyGlenn County
StateCalifornia
Coordinates39.55666, -122.13684
Functional classRural Major 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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to 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 spans6
Design loadUnknown
Structure length76 ft (23.2 m)
Longest span12 ft (3.7 m)
Deck width28 ft (8.6 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic381 (2009)
Projected traffic536 by 2043
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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 County RD P over Glenn-Colusa Canal built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1961.

What condition is County RD P 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 County RD P over Glenn-Colusa Canal carry?

About 381 vehicles per day (2009 count), of which roughly 20% are trucks.

How long is County RD P over Glenn-Colusa Canal?

The structure is 76 ft (23.2 m) long with a longest span of 12 ft (3.7 m) and a deck 28 ft wide.

Who owns County RD P over Glenn-Colusa Canal?

It is owned by the County Highway Agency.