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Geography of the Parker Basin

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.


Click here for Figure 7.6-1

Figure 7.6-1 Parker Basin Geographic Features


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References and Supplemental Reading for the Parker Basin

Colorado River
Lower Colorado River Planning Area
Click to download Volume 7
Imperial NWR
Parker Dam