US Bridges

Interstate 8 WB over Central Main Canal Austn

Fair

Imperial County, California · 11-IMP-008-R35.47 · Structure no. 58 0249L

Built
1967
58 years old
Condition
Fair
inspected February 2025
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
231 ft
4 main spans
Daily traffic
8,700
2019 count
Owner
State
State Highway Agency

About this bridge

Interstate 8 WB over Central Main Canal Austn is a concrete continuous box beam or girders - multiple carrying Interstate 8 WB over Central Main Canal Austn in Imperial County, California. It was built in 1967, so it is 58 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 8,700 vehicles a day, roughly 14% of them trucks, projected to reach 20,972 by 2046. The structure is 231 ft (70.4 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesInterstate 8 WB
CrossesCentral Main Canal Austn
Location11-IMP-008-R35.47
RouteInterstate 8
Coordinates32.77399, -115.59519
Functional classRural Principal Arterial - Interstate

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating38.6 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length231 ft (70.4 m)
Longest span90 ft (27.4 m)
Deck width41 ft (12.5 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,700 (2019)
Projected traffic20,972 by 2046
Trucks14%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 Interstate 8 WB over Central Main Canal Austn built?

It was built in 1967, making it 58 years old in 2025.

What condition is Interstate 8 WB over Central Main Canal Austn 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 February 2025.

How much traffic does Interstate 8 WB over Central Main Canal Austn carry?

About 8,700 vehicles per day (2019 count), of which roughly 14% are trucks.

How long is Interstate 8 WB over Central Main Canal Austn?

The structure is 231 ft (70.4 m) long with a longest span of 90 ft (27.4 m) and a deck 41 ft wide.

Who owns Interstate 8 WB over Central Main Canal Austn?

It is owned by the State Highway Agency.