US Bridges

County RD R over Glenn-Colusa Canal

PoorPosted for load

Glenn County, California · 0.3 MI N/O County RD 39 · Structure no. 11C0011

Built
1950
75 years old, rebuilt 2002
Condition
Poor
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
104 ft
6 main spans
Daily traffic
85
2011 count
Owner
County
County Highway Agency

About this bridge

County RD R over Glenn-Colusa Canal is a steel continuous stringer/multi-beam or girder carrying County RD R over Glenn-Colusa Canal in Glenn County, California. It was built in 1950 and reconstructed in 2002, so it is 75 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 85 vehicles a day, roughly 40% of them trucks, projected to reach 117 by 2045. The structure is 104 ft (31.7 m) long and 22 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesCounty RD R
CrossesGlenn-Colusa Canal
Location0.3 MI N/O County RD 39
RouteCounty Highway 0
Coordinates39.58683, -122.11682
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating0 US tons
Inventory rating0 US tons

Structure

MaterialSteel Continuous
DeckCorrugated steel
Main spans6
Design loadUnknown
Structure length104 ft (31.7 m)
Longest span17 ft (5.2 m)
Deck width22 ft (6.7 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic85 (2011)
Projected traffic117 by 2045
Trucks40%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$745,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD R over Glenn-Colusa Canal built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 2002.

What condition is County RD R over Glenn-Colusa Canal in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in January 2025.

How much traffic does County RD R over Glenn-Colusa Canal carry?

About 85 vehicles per day (2011 count), of which roughly 40% are trucks.

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

The structure is 104 ft (31.7 m) long with a longest span of 17 ft (5.2 m) and a deck 22 ft wide.

Who owns County RD R over Glenn-Colusa Canal?

It is owned by the County Highway Agency.