US Bridges

State Route 20 over 7th ST Cnfr E Side Cnl

Good

Colusa County, California · 03-COL-020-R21.85 · Structure no. 15 0024

Built
1971
54 years old
Condition
Good
inspected January 2025
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
343 ft
3 main spans
Daily traffic
5,800
2012 count
Owner
State
State Highway Agency

About this bridge

State Route 20 over 7th ST Cnfr E Side Cnl is a prestressed concrete continuous box beam or girders - multiple carrying State Route 20 over 7th ST Cnfr E Side Cnl in Colusa County, California. It was built in 1971, so it is 54 years old, younger than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 5,800 vehicles a day, roughly 11% of them trucks, projected to reach 6,960 by 2043. The structure is 343 ft (104.5 m) long and 42 ft wide. If it were closed, the detour would be 18 mi (29 km).

CarriesState Route 20
Crosses7th ST Cnfr E Side Cnl
Location03-COL-020-R21.85
RouteState Highway 20
Coordinates39.16471, -122.15422
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating21.4 US tons
Inventory rating10.4 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length343 ft (104.5 m)
Longest span121 ft (36.9 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,800 (2012)
Projected traffic6,960 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway, waterway and railroad
Detour if closed18 mi (29 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 State Route 20 over 7th ST Cnfr E Side Cnl built?

It was built in 1971, making it 54 years old in 2025.

What condition is State Route 20 over 7th ST Cnfr E Side Cnl in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2025.

How much traffic does State Route 20 over 7th ST Cnfr E Side Cnl carry?

About 5,800 vehicles per day (2012 count), of which roughly 11% are trucks.

How long is State Route 20 over 7th ST Cnfr E Side Cnl?

The structure is 343 ft (104.5 m) long with a longest span of 121 ft (36.9 m) and a deck 42 ft wide.

Who owns State Route 20 over 7th ST Cnfr E Side Cnl?

It is owned by the State Highway Agency.