Major aquifers, well yields, estimated natural recharge, estimated water in storage, number of index wells and date of last water-level sweep are shown in Table 4.6-6.  Figure 4.6-6 shows aquifer flow direction and water-level change between 1990-1991 and 2003-2004.  Figure 4.6-7 contains hydrographs for selected wells shown on Figure 4.6-6.  Figure 4.6-8 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 4.6-6 and Figure 4.6-6.
• The major aquifer in this basin is recent stream alluvium.
• Flow direction is from north to south in this basin.

Well Yields

• Refer to Table 4.6-6 and Figure 4.6-8.
• As shown on Figure 4.6-8 well yields in this basin range from less than 100 gallons per minute (gpm) to greater than 2,000 gpm.
• One source of well yield information, based on 96 reported wells, indicates that the median well yield in this basin is 1,000 gpm.

Natural Recharge

• Refer to Table 4.6-6
• The estimate of natural recharge for this basin is 183,000 acre-feet per year (AFA).  Recharge comes principally from infiltration of Colorado River water.

Water in Storage

• Refer to Table 4.6-6.
• Storage estimates for this basin range from 1.2 million acre-feet (maf) to 8.0 maf to a depth of 1,200 feet

Water Level

• Refer to Figure 4.6-6. Water levels are shown for wells measured in 2003-2004.
• The Department annually measures three index wells in this basin.  Hydrographs for two of these wells are shown in Figure 4.6-7.  More recent hydrographs of the index wells may be available through the Department's GWSI webpage.

• Of the three water depths shown, the deepest is 427 feet south of Bullhead City and the shallowest is 337 feet north of Mohave Valley.

Click to view Table 4.6-6 Groundwater Data for the

Lake Mohave Basin

Click to view Figure 4.6-6 Lake Mohave Basin

Groundwater Conditions