US Bridges

Southern Ave over Cap Canal (mesa)

Fair

Maricopa County, Arizona · 0.6 MI E/ Signal Butte RD · Structure no. 08884

Built
1986
39 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
145 ft
1 main span
Daily traffic
8,194
2023 count
Owner
County
County Highway Agency

About this bridge

Southern Ave over Cap Canal (mesa) is a prestressed concrete stringer/multi-beam or girder carrying Southern Ave over Cap Canal (mesa) in Maricopa County, Arizona. It was built in 1986, so it is 39 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 8,194 vehicles a day, roughly 10% of them trucks, projected to reach 8,204 by 2042. The structure is 145 ft (44.1 m) long and 77 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSouthern Ave
CrossesCap Canal (mesa)
Location0.6 MI E/ Signal Butte RD
RouteCounty Highway 0
CountyMaricopa County
StateArizona
Coordinates33.39322, -111.58695
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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating84.8 US tons
Inventory rating32 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length145 ft (44.1 m)
Longest span140 ft (42.7 m)
Deck width77 ft (23.6 m)
Roadway width68 ft (20.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,194 (2023)
Projected traffic8,204 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Southern Ave over Cap Canal (mesa) built?

It was built in 1986, making it 39 years old in 2025.

What condition is Southern Ave over Cap Canal (mesa) 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 December 2024.

How much traffic does Southern Ave over Cap Canal (mesa) carry?

About 8,194 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Southern Ave over Cap Canal (mesa)?

The structure is 145 ft (44.1 m) long with a longest span of 140 ft (42.7 m) and a deck 77 ft wide.

Who owns Southern Ave over Cap Canal (mesa)?

It is owned by the County Highway Agency.