US Bridges

Southern Ave over Loop 101

Fair

Maricopa County, Arizona · 0.5 MI N of JCT US 60 · Structure no. 02074

Built
1990
35 years old
Condition
Fair
inspected January 2025
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
315 ft
2 main spans
Daily traffic
21,814
2023 count
Owner
State
State Highway Agency

About this bridge

Southern Ave over Loop 101 is a prestressed concrete continuous box beam or girders - single or spread carrying Southern Ave over Loop 101 in Maricopa County, Arizona. It was built in 1990, so it is 35 years old, younger 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 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 21,814 vehicles a day, roughly 21% of them trucks, projected to reach 21,824 by 2042. The structure is 315 ft (96 m) long and 138 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSouthern Ave
CrossesLoop 101
Location0.5 MI N of JCT US 60
RouteCity Street 0
CountyMaricopa County
StateArizona
Coordinates33.3929, -111.8917
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80 US tons
Inventory rating36 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length315 ft (96 m)
Longest span160 ft (48.8 m)
Deck width138 ft (42.2 m)
Roadway width118 ft (36 m)
Vertical clearance over deck26 ft (7.9 m)

Traffic and service

Average daily traffic21,814 (2023)
Projected traffic21,824 by 2042
Trucks21%
Lanes on structure10
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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$5,000 (2020 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Southern Ave over Loop 101 built?

It was built in 1990, making it 35 years old in 2025.

What condition is Southern Ave over Loop 101 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 January 2025.

How much traffic does Southern Ave over Loop 101 carry?

About 21,814 vehicles per day (2023 count), of which roughly 21% are trucks.

How long is Southern Ave over Loop 101?

The structure is 315 ft (96 m) long with a longest span of 160 ft (48.8 m) and a deck 138 ft wide.

Who owns Southern Ave over Loop 101?

It is owned by the State Highway Agency.