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Securing Arizona's Water Future
Geography of the San Bernardino Valley Basin

The San Bernardino Valley Basin is a small, 387 square mile basin in the southeastern corner of the planning area.  Geographic features and principal communities are shown on Figure 3.11-1.   The basin is characterized by a valley flanked by two mountain ranges. Vegetation is primarily semi-desert grassland with smaller areas of madrean evergreen woodland and Chihuahuan desertscrub. (see Figure 3.0-9)  Riparian vegetation includes mesquite and cottonwood/willow along Black Draw.

Principal geographic features shown on Figure 3.11-1 are:

  • San Bernardino Valley in the center of the basin

  • Black Draw east of Bernardino running north-south to the Mexico border

  • Peloncillo Mountains to the east

  • Pedregosa Mountains on the northwest basin boundary

  • Perilla Mountains to the west, which include the highest point in the basin at 6,391 feet

  • The lowest point at approximately 3,700 feet where Black Draw exits the basin

Click to view Figure 3.11-1

Click to view Figure 3.11-1 San Bernardino Valley Basin Geographic Features

 

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Pond at San Bernardino Wildlife Refuge San Bernardino Valley Basin