US Bridges

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

Fair

Shasta County, California · 02-SHA-273-13.31-RDG · Structure no. 06 0010

Built
1942
83 years old, rebuilt 1995
Condition
Fair
inspected April 2023
Type
Slab
Concrete Continuous
Length
80 ft
4 main spans
Daily traffic
23,000
2020 count
Owner
State
State Highway Agency

About this bridge

State Route 273 over A.C.I.D. Canal is a concrete continuous slab carrying State Route 273 over A.C.I.D. Canal in Shasta County, California. It was built in 1942 and reconstructed in 1995, so it is 83 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 23,000 vehicles a day, roughly 4% of them trucks, projected to reach 35,164 by 2041. The structure is 80 ft (24.4 m) long and 93 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesState Route 273
CrossesA.C.I.D. Canal
Location02-SHA-273-13.31-RDG
RouteState Highway 273
CountyShasta County
StateCalifornia
Coordinates40.5383, -122.38503
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length80 ft (24.4 m)
Longest span20 ft (6 m)
Deck width93 ft (28.3 m)
Roadway width90 ft (27.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,000 (2020)
Projected traffic35,164 by 2041
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was State Route 273 over A.C.I.D. Canal built?

It was built in 1942, making it 83 years old in 2025. It was reconstructed in 1995.

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 23,000 vehicles per day (2020 count), of which roughly 4% are trucks.

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

The structure is 80 ft (24.4 m) long with a longest span of 20 ft (6 m) and a deck 93 ft wide.

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

It is owned by the State Highway Agency.