US Bridges

Southern Ave over Tempe Canal

FairPosted for load

Maricopa County, Arizona · 0.5 MI W Dobson · Structure no. 09390

Built
1940
85 years old, rebuilt 1973
Condition
Fair
inspected September 2024
Type
Slab
Concrete Continuous
Length
42 ft
2 main spans
Daily traffic
30,539
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Southern Ave over Tempe Canal is a concrete continuous slab carrying Southern Ave over Tempe Canal in Maricopa County, Arizona. It was built in 1940 and reconstructed in 1973, so it is 85 years old, older than the Arizona average of 47.8 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. Its operating status is: posted for load restriction.

It carries about 30,539 vehicles a day, roughly 5% of them trucks, projected to reach 30,549 by 2042. The structure is 42 ft (12.8 m) long and 87 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesSouthern Ave
CrossesTempe Canal
Location0.5 MI W Dobson
RouteCity Street 0
StateArizona
Coordinates33.39304, -111.8802
Functional classUrban Minor Arterial

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating21.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 15
Structure length42 ft (12.8 m)
Longest span21 ft (6.4 m)
Deck width87 ft (26.4 m)
Roadway width68 ft (20.7 m)
Vertical clearance over deck20 ft (6.1 m)

Traffic and service

Average daily traffic30,539 (2023)
Projected traffic30,549 by 2042
Trucks5%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Southern Ave over Tempe Canal built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1973.

What condition is Southern Ave over Tempe 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 September 2024.

How much traffic does Southern Ave over Tempe Canal carry?

About 30,539 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Southern Ave over Tempe Canal?

The structure is 42 ft (12.8 m) long with a longest span of 21 ft (6.4 m) and a deck 87 ft wide.

Who owns Southern Ave over Tempe Canal?

It is owned by the City or Municipal Highway Agency.