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Groundwater Conditions in the Parker Basin

Major aquifers, well yields, estimated water in storage, number of index wells and date of last water-level sweep are shown in Table 7.6-6Figure 7.6-6 shows aquifer flow direction and water-level change between 1990-1991 and 2003-2004.  Figure 7.6-7 contains hydrographs for selected wells shown on Figure 7.6-6.  Figure 7.6-8 shows well yields in five yield categories.  A description of aquifer data sources and methods as well as well data sources and methods, including water-level changes and well yields are found in Volume 1, Appendix A. 

Major Aquifers

  • Refer to Table 7.6-6 and Figure 7.6-6.
  • The major aquifer is recent stream alluvium and sedimentary rock (Bouse Formation).
  • Groundwater flow is from the south and east toward the Colorado River.

Well Yields

  • Refer to Table 7.6-6 and Figure 7.6-8.
  • As shown on Figure 7.6-8, well yields are generally less than 100 gallons per minute (gpm) although higher well yields are found near the Colorado River.
  • One source of well yield information, based on 75 reported wells, indicates that the median well yield is 100 gpm.

Natural Recharge

  • Refer to Table 7.6-6.
  • The natural recharge estimate for this basin is 241,000 acre-feet per year (AFA).
  • The largest source of natural recharge is the Colorado River (ADWR 1994).

Water in Storage

  • Refer to Table 7.6-6.
  • Storage estimates for this basin range from 14 million acre-feet (maf) to 24 maf to a depth of 1,200 feet. 

Water Level

  • Refer to Figure 7.6-6. Water levels are shown for wells measured in 2003-2004.
  • The Department annually measures six index wells in this basin.  Hydrographs for five of these wells and two additional wells (B and G) are shown on Figure 7.6-7
  • The deepest water level shown on the map is 553 feet north of Quartzsite and the shallowest is 10 feet west of the Cibola Ehrenberg Road near the Colorado River.

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Table 7.6-6 Groundwater Data for the Parker Basin

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Figure 7.6-6 Parker Basin Groundwater Conditions

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Figure 7.6-7 Parker Basin Hydrographs Showing Depth to Water in Selected Wells

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Figure 7.6-8 Parker Basin Well Yields


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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