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Groundwater Conditions in the Coconino Plateau Basin

Major aquifers, well yields, estimated water in storage, number of index wells and date of last water-level sweep are shown in Table 6.1-6.  Figure 6.1-7 shows aquifer flow direction and water-level change between 1990-1991 and 2003-2004.  Figure 6.1-8 contains hydrographs for selected wells shown on Figure 6.1-7.  Figure 6.1-9 shows well yields in four 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

  • Major aquifers in the basin include volcanic rocks, basin fill and sedimentary rocks (C- and R-aquifers and Moenkopi and Chinle Formations).

  • Almost all of the basin geology consists of consolidated crystalline and sedimentary rock.

  • Flow direction is toward the Little Colorado River in the eastern portion of the basin and generally toward the west and north in the western portion of the basin.

Well Yields

  • As shown on Figure 6.1-9, well yields in this basin are generally less than 100 gallons per minute (gpm).  However, there are several relatively high yield wells owned by the City of Flagstaff in the southeast part of the basin.

  • One source of well yield information, based on 16 reported wells, indicates that the median well yield in this basin is 45.5 gpm.

Water Level

  • Refer to Figure 6.1-7. 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 (B and C) and one other well are shown on Figure 6.1-8. More recent hydrographs of the index wells may be available through the Department's GWSI webpage.
  • All water level information is from the southern portion of the basin.  Although not shown on the map, there are three wells with a depth to water of over 2,700 feet in the vicinity of Williams.  The shallowest water level shown on the map is five feet in a perched aquifer south of Williams.



Click to view Table 6.1-6

Click for Table 6.1-6 Groundwater Data for the

Coconino Plateau Basin

Click to view Figure 6.1-7

Click for Figure 6.1-7 Coconino Plateau Basin

Groundwater Conditions

Click to view Figure 6.1-8

Click for Figure 6.1-8 Coconino Plateau Basin Hydrographs Showing Depth to Water in Selected Wells

Click to view Figure 6.1-9

Click for Figure 6.1-9 Coconino Plateau Basin

Well Yields



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