Streamflow data, including average seasonal flow, average annual flow and other information are shown in Table 7.8-2.  Reservoir and stockpond data, including maximum storage or maximum surface area, are shown in Table 7.8-3. The location of streamflow gages identified by USGS number, USGS runoff contours and large reservoirs are shown on Figure 7.8-4.  There are no flood ALERT stations in this basin.  Descriptions of stream, reservoir and stockpond data sources and methods are found in Volume 1, Appendix A.

Streamflow Data

• Refer to Table 7.8-2.
• Data from three stations located at two watercourses are shown in the table and on Figure 7.8-4.  One station has been discontinued.
• Average seasonal flow at all three stations is highest in the summer season (July-September).  All three stations report zero average seasonal flow in the spring season (April-June). 
• The largest annual flow recorded in the basin is 39,684 acre-feet in 1983 at the Vamori Wash at Kom Vo station. 

Reservoirs and Stockponds

• Refer to Table 7.8-3.
• The basin contains one large reservoir, Menegers Lake, with a maximum storage of 15,000 acre-feet.  This reservoir is used for irrigation.
• Surface water is stored or could be stored in 12 small reservoirs. 
• There are three registered stockponds in this basin.

Runoff Contour

• Refer to Figure 7.8-4.
• Average annual runoff is highest, 0.5 inches per year or 26.65 acre-feet per square mile, in the eastern portion of the basin around Sells and decreases to 0.1 inches, or 5.33 acre-feet per square mile, in the southwest corner of the basin.

Table 7.8-2 Streamgages in the San Simon Wash Basin

Table 7.8-3 Reservoirs and Stockponds in the San Simon Wash Basin

Figure 7.8-4 San Simon Wash Basin Surface Water Conditions

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