The Parker Basin, located in the western part of the planning area is 2,229 square miles in area.  Geographic features and principal communities are shown on Figure 7.6-1.  The basin is characterized by plains and valleys with low elevation mountain ranges.  Vegetation types include Lower Colorado River Valley and Arizona Uplands Sonoran desertscrub. (See Figure 7.0-9)  Riparian vegetation includes tamarisk, marsh and mesquite along the Colorado River.

Principal geographic features shown on Figure 7.6-1 are:

• Plains and valleys including La Posa Plain in the center of the basin, Parker Valley on the northwestern basin boundary and Cactus Plain in the northern portion of the basin
• Mountain ranges including the Trigo and Dome Rock Mountains in the center of the basin
• The highest point in the basin, Cunningham Mountain, at 3,314 feet in the Dome Rock Mountains east of Ehrenberg and the Kofa Mountains on the eastern basin boundary
• The lowest point at 150 feet where the Colorado River exits the basin.

Figure 7.6-1 Parker Basin Geographic Features

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References and Supplemental Reading for the Parker Basin