skip to the content of this page Arizona's Official Website Arizona Department of Water Resources
Arizona Department of Water Resources Arizona's Official Web Site
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



Arizona Water Atlas Home

Southeastern Arizona Planning Area Home

Download pdf of entire Southeastern Arizona Planning Area Download pdf of the Upper San Pedro Basin References and Supplemental Reading for the Upper San Pedro Basin
Colorado River Southeastern Arizona Planning Area

Download Southeastern Arizona Planning Area Atlas

Benson Narrows Gage Cascabel Road