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Securing Arizona's Water Future
Geography of the Upper San Pedro Basin

The Upper San Pedro Basin is a medium-size, 1,825 square mile basin in the southwestern portion of the planning area.  Geographic features and principal communities are shown on Figure 3.13-1. The basin is characterized by a large valley flanked by a series of mountain ranges.  Vegetation is primarily semi-desert grassland and Chihuahuan desertscrub with smaller areas of madrean evergreen woodland, plains and Great Basin grasslands and Rocky Mountain and madrean montane conifer forest. (see Figure 3.0-9)   Riparian vegetation includes cottonwood/willow, mesquite and tamarisk along the San Pedro River and conifer oak and mixed broadleaf along Gardner, Ramsey and Miller Canyons.

Principal geographic features shown on Figure 3.13-1 are:

  • San Pedro River, which flows north through the San Pedro Valley east of Sierra Vista and Benson

  • Babocomari River north of Sierra Vista

  • Garden and Ramsey canyons southwest of Sierra Vista

  • Tres Alamos Wash northeast of Benson

  • Greenbrush Draw north of the Mexico border in the vicinity of Naco

  • Huachuca Mountains southwest of Sierra Vista

  • Whetstone Mountains southwest of Whetstone

  • Canelo Hills west of Canelo

  • Mule Mountains east of Bisbee

  • Dragoon Mountains along the eastern boundary of the basin east of St. David

  • Allen Flat in the northern part of the basin

  • The highest point in the basin, 9,466 feet, at T23S, R20E in the Huachuca Mountains

  • The lowest point at approximately 3,000 feet where the San Pedro River exits the basin

Click to view Figure 3.13-1

Click to view Figure 3.13-1 Upper San Pedro BasinGeographic Features

 

 

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Benson Narrows Gage Cascabel Road