US Bridges

State Route 273 over A.C.I.D. Canal

Fair

Shasta County, California · 02-SHA-273-4.52-AND · Structure no. 06 0104

Built
1948
77 years old, rebuilt 1961
Condition
Fair
inspected April 2023
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
9,800
2020 count
Owner
State
State Highway Agency

About this bridge

State Route 273 over A.C.I.D. Canal is a concrete continuous culvert carrying State Route 273 over A.C.I.D. Canal in Shasta County, California. It was built in 1948 and reconstructed in 1961, so it is 77 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 9,800 vehicles a day, roughly 8% of them trucks, projected to reach 21,575 by 2041. The structure is 21 ft (6.3 m) long and 97 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesState Route 273
CrossesA.C.I.D. Canal
Location02-SHA-273-4.52-AND
RouteState Highway 273
CountyShasta County
StateCalifornia
Coordinates40.43952, -122.29174
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection9 ExcellentNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length21 ft (6.3 m)
Longest span10 ft (3 m)
Deck width97 ft (29.5 m)
Roadway width96 ft (29.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,800 (2020)
Projected traffic21,575 by 2041
Trucks8%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 273 over A.C.I.D. Canal built?

It was built in 1948, making it 77 years old in 2025. It was reconstructed in 1961.

What condition is State Route 273 over A.C.I.D. 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 April 2023.

How much traffic does State Route 273 over A.C.I.D. Canal carry?

About 9,800 vehicles per day (2020 count), of which roughly 8% are trucks.

How long is State Route 273 over A.C.I.D. Canal?

The structure is 21 ft (6.3 m) long with a longest span of 10 ft (3 m) and a deck 97 ft wide.

Who owns State Route 273 over A.C.I.D. Canal?

It is owned by the State Highway Agency.