Tenmile Wash

To provide comments on this watershed for consideration in the Floodplain Management Plan, contact Greg Saxe
Planning Manager
(520) 724-4633.
The Tenmile Wash watershed includes Gibson Arroyo within the community of Ajo and extends from the Pozo Redondo and Batamote mountains in the east across the basin floor to the Little Ajo and Childs mountains in the west. From these head-waters, this watershed then drains northward into Maricopa County. The District has documented numerous flooded homes in Ajo and Why, Arizona. Floods in these areas arrive with little warning and extreme caution is warranted during inclement weather. Flood insurance is highly recommended. This water-shed is comprised of 207,127 acres and contains 11,763 acres of SFHA, 182 acres of locally identified floodplain and 13,409 acres of Pima County Regulated Riparian Habitat.

Flood Hazards


Watershed Map 
Outreach Brochure 
Hazard Map 

Floodplain Studies

Floodplain Study FP-052-2004 - Emergency Evaluation Study Report on the July 29, 2003, Flooding in Ajo, Arizona, TetraTech, April 2004. Ajo Flood depth map, PCRFCD, 2010.

Drainage Study for the Curley School Detention Basin, Ajo, Arizona, DMJM Harris, January 2006.

Erosion Studies

There are currently no erosion studies in this watershed.

Step 6 - Floodplain Management Plan Goals

Floodplain Management Plan Goals

Recommendation of Actions and Floodplain Management Strategy

Tenmile Wash Action Plan Map

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Regional Flood Control District

201 N. Stone Avenue, 9th Fl.
Tucson, AZ 85701

Phone: (520) 724-4600
Fax: (520) 724-4621

Customer Service Hours:
8:00AM - 4:00PM

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