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Groundwater Conditions in the Gila Bend Basin

Major aquifers, well yields, estimated water in storage, number of index wells and date of last water-level sweep are shown in Table 7.2-6Figure 7.2-6 shows aquifer flow direction and water-level change between 1990-1991 and 2003-2004.  Figure 7.2-7 contains hydrographs for selected wells shown on Figure 7.2-6.  Figure 7.2-8 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 7.2-6 and Figure 7.2-6
  • The major aquifer is basin fill.
  • Flow direction is from north to southwest in the center of the basin and from the west to east in the northern portion of the basin. 

Well Yields

  • Refer to Table 7.2-6 and Figure 7.2-8
  • As shown on Figure 7.2-8, well yields are generally greater than 2,000 gallons per minute (gpm). 
  • One source of well yield information, based on 242 reported wells, indicates that the median well yield is 2,700 gpm.

Natural Recharge

  • Refer to Table 7.2-6
  • Natural recharge estimates range from 10,000 acre-feet per year (AFA) to 37,000 AFA.
  • The largest source of natural recharge in the basin occurs from Gila River flood events and infiltration of water impounded behind Painted Rock Dam (ADWR 1994b).

Water in Storage

  • Refer to Table 7.2-6
  • Storage estimates for this basin range from 17 million acre-feet (maf) to maf, both to a depth of 1,200 feet. 

Water Level

  • Refer to Figure 7.2-6. Water levels are shown for wells measured in 2003-2004.
  • The Department annually measures 30 index wells in this basin.  Hydrographs for seven index wells are shown on Figure 7.2-7
  • The deepest water level shown on the map is 639 feet south of Maricopa Road and the shallowest is 34 feet near the western basin boundary.



Click here for Table 7.2-6

Table 7.2-6 Groundwater Data for the Gila Bend Basin

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Figure 7.2-6 Gila Bend Basin Groundwater Conditions

Click here for Figure 7.2-7

Figure 7.2-7 Gila Bend Basin Hydrographs Showing Depth to Water in Selected wells

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Figure 7.2-8 Gila Bend Basin Well Yields

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References and Supplemental Reading for the Gila Bend Basin

Colorado River
Lower Colorado River Planning Area
Click to download Volume 7
Gillespie Dam
Agriculture near Town of Gila Bend