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Securing Arizona's Water Future
Geography of the Donnelly Wash Basin

The Donnelly Wash Basin is a small, 293 square mile basin in the northwestern portion of the planning area.  Geographic features and principal communities are shown on Figure 3.4-1.  The basin is characterized by low elevation hills, washes and canyons.  Vegetation is primarily Arizona Sonoran desertscrub with a smaller area of semi-desert grassland. (see Figure 3.0-9).

Principal geographic features shown on Figure 3.4-1 are:

  • Gila River, which runs east-west through Cochran
  • Box Canyon and Walnut Canyon entering from the north and terminating at the Gila River
  • Donnelly Wash, Cottonwood Wash and Box Wash, which run roughly parallel to each other south of Cochran
  • The Ninety-Six Hills along the southwest boundary, which include the highest point in the basin at 4,420 feet
  • The lowest point at 1,600 feet at Price where the Gila River exits the basin.

Click to view Figure 3.4-1

Click for Figure 3.4-1 Donnelly Wash Basin Geographic Features

 

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Gila River in Donnelly Wash Basin Tortilla Mountains