US Bridges

Southern Ave over Cap Drainage Channel

Good

Maricopa County, Arizona · 0.5 MI E/ Signal Butte RD · Structure no. 07716

Built
1989
36 years old
Condition
Good
inspected January 2025
Type
Culvert
Concrete Continuous
Length
43 ft
4 main spans
Daily traffic
9,149
2023 count
Owner
County
County Highway Agency

About this bridge

Southern Ave over Cap Drainage Channel is a concrete continuous culvert carrying Southern Ave over Cap Drainage Channel in Maricopa County, Arizona. It was built in 1989, so it is 36 years old, younger than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 9,149 vehicles a day, roughly 10% of them trucks, projected to reach 9,159 by 2042. The structure is 43 ft (13.1 m) long. If it were closed, the detour would be 1.9 mi (3 km).

CarriesSouthern Ave
CrossesCap Drainage Channel
Location0.5 MI E/ Signal Butte RD
RouteCounty Highway 0
StateArizona
Coordinates33.39305, -111.58879
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 36 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans4
Design loadHS 20
Structure length43 ft (13.1 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,149 (2023)
Projected traffic9,159 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Drainage Channel built?

It was built in 1989, making it 36 years old in 2025.

What condition is Southern Ave over Cap Drainage Channel in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2025.

How much traffic does Southern Ave over Cap Drainage Channel carry?

About 9,149 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Southern Ave over Cap Drainage Channel?

The structure is 43 ft (13.1 m) long with a longest span of 10 ft (3 m).

Who owns Southern Ave over Cap Drainage Channel?

It is owned by the County Highway Agency.