Streamflow data, including average seasonal flow, average annual flow and other information are shown in Table 7.6-2.  Flood ALERT equipment in the basin is shown in Table 7.6-3.  Reservoir and stockpond data, including maximum storage or maximum surface area, are shown in Table 7.6-4. The location of streamflow gages identified by USGS number, flood ALERT equipment and large reservoirs are shown on Figure 7.6-4.  There are no USGS runoff contour data available for this basin.  Descriptions of stream, reservoir and stockpond data sources and methods are found in Volume 1, Appendix A. 

Streamflow Data

• Refer to Table 7.6-2.
• Data from three stations, two real-time and one discontinued, located on the Colorado River are shown in the table and on Figure 7.6-4. 
• Average seasonal flow is highest in spring and summer at the three stations and is regulated by scheduled releases from dams.
• The largest annual flow recorded in the basin is more than 20 million acre feet in 1984 at the Colorado River below Parker Dam station with a contributing drainage area of 182,700 square miles. 

Flood ALERT Equipment

• Refer to Table 7.6-3.
• As of October 2005 there was one precipitation station in the basin located at Tyson Wash.

Reservoirs and Stockponds

• Refer to Table 7.6-4.
• The basin contains five large reservoirs or dams.  The largest, Lake Havasu, with a maximum storage of 651,000 acre-feet, is located in the Upper Colorado River Planning Area but Parker Dam is located at the basin boundary.
• Reservoirs in this basin are used for water supply, irrigation, hydroelectric power, recreation and fish and wildlife.
• Surface water is stored or could be stored in five small reservoirs in the basin. 
• There are five registered stockponds in this basin.

Table 7.6-2 Streamflow Data for the Parker Basin

Table 7.6-3 Flood ALERT Equipment in the Parker Basin

Table 7.6-4 Reservoirs and Stockponds in the Parker Basin

Figure 7.6-4 Parker Basin Surface Water Conditions

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References and Supplemental Reading for the Parker Basin