US Bridges

County Line RD over RD 108 10P Canal

Poor

Colusa County, California · 4.6 MI East of I-5 · Structure no. 15C0052

Built
1978
47 years old
Condition
Poor
inspected October 2023
Type
Slab
Concrete Continuous
Length
74 ft
3 main spans
Daily traffic
170
2014 count
Owner
County
County Highway Agency

About this bridge

County Line RD over RD 108 10P Canal is a concrete continuous slab carrying County Line RD over RD 108 10P Canal in Colusa County, California. It was built in 1978, so it is 47 years old, younger 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 4 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.

It carries about 170 vehicles a day, roughly 10% of them trucks, projected to reach 267 by 2042. The structure is 74 ft (22.7 m) long and 29 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesCounty Line RD
CrossesRD 108 10P Canal
Location4.6 MI East of I-5
RouteCounty Highway 0
CountyColusa County
StateCalifornia
Coordinates38.9253, -121.91419
Functional classRural Minor Collector

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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.1 US tons
Inventory rating34.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length74 ft (22.7 m)
Longest span28 ft (8.5 m)
Deck width29 ft (8.7 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic170 (2014)
Projected traffic267 by 2042
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$336,000 (2018 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County Line RD over RD 108 10P Canal built?

It was built in 1978, making it 47 years old in 2025.

What condition is County Line RD over RD 108 10P 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 October 2023.

How much traffic does County Line RD over RD 108 10P Canal carry?

About 170 vehicles per day (2014 count), of which roughly 10% are trucks.

How long is County Line RD over RD 108 10P Canal?

The structure is 74 ft (22.7 m) long with a longest span of 28 ft (8.5 m) and a deck 29 ft wide.

Who owns County Line RD over RD 108 10P Canal?

It is owned by the County Highway Agency.