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Prescott AMA Surface Water Conditions

Streamflow data, including average seasonal flow, annual flow and other information are shown in Table 8.3-2.  Flood ALERT equipment in the AMA is shown in Table 8.3-3.  Flood ALERT equipment information is current up to October 2005.  New flood warning gages are routinely added to the ALERT network so the current number of stations may be greater. Reservoir and stockpond data, including maximum storage or maximum surface area, are shown in Table 8.3-4. The location of streamflow gages identified by USGS number, flood ALERT equipment, USGS runoff contours and large reservoirs are shown on Figure 8.3-4.  Descriptions of stream, reservoir and stockpond data sources and methods are found in Volume 1, Appendix A. 

Streamflow Data

  • Refer to Table 8.3-2.
  • Data from six stations located at four watercourses are shown in the table and on Figure 8.3-4
  • Average seasonal flow is highest at all stations in the winter season (January-March). 
  • The largest annual flow recorded in the AMA is 18,757 acre-feet in 2005 at the Granite Creek near Prescott gage with a contributing drainage area of 36 square miles. 

Flood ALERT Equipment

  • Refer to Table 8.3-3.
  • There are 21 ALERT gages in the AMA, primarily precipitation or precipitation/stage gages.

Reservoirs and Stockponds

  • Refer to Table 8.3-4.
  • The AMA contains four large reservoirs.  The largest, Willow Creek, has a maximum storage of 7,800 acre-feet.
  • Reservoir uses include recreation and water supply. 
  • Surface water is stored or could be stored in 13 small reservoirs. 
  • There are 216 registered stockponds in the AMA.

Runoff Contour

  • Refer to Figure 8.3-4.
  • Average annual runoff is one inch or 53.33 acre-feet per square mile.

Click to view Table 8.3-2

Table 8.3-2 Streamflow Data for the Prescott AMA

Click to view Table 8.3-3

Table 8.3-3 ALERT Equipment in the Prescott AMA

Click to view Table 8.3-4

Table 8.3-4 Reservoirs and Stockponds in the Prescott AMA

Click to view Figure 8.3-4

Figure 8.3-4 Prescott AMA Surface Water Conditions


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