Streamflow data, including average seasonal flow, average annual flow and other information is shown in Table 4.2-2.   Flood ALERT equipment in the basin is shown in Table 4.2-3.  Reservoir and stockpond data, including maximum storage or maximum surface area, are shown in Table 4.2-4.   The location of streamflow gages identified by USGS number, flood ALERT equipment, USGS runoff contours and large reservoirs are shown on Figure 4.1-4.  Descriptions of stream, reservoir and stockpond data sources and methods are found in Volume 1, Appendix A.  Additional information on surface water in this basin can be found in Section 4.2.5 - Perennial/ Intermittent Streams and Springs and Section 4.0.5 - Surface Water Hydrology. Where available, the header for each section provides a link to the data web site.  

Streamflow Data

• Refer to Table 4.2-2.

• Data from ten stations on seven watercourses are shown in the table and on Figure 4.2-4.  Five stations have been discontinued, the remaining five are real-time stations.

• The average seasonal flow for all stations is highest in the winter (January-March) and lowest in the fall (October-December).

• Maximum annual flow in this basin was 701,711 acre-feet in 1993 at the Bill Williams station below Alamo Dam and minimum annual flow was 0 acre-feet in 1942 at the Date Creek station.

Flood ALERT Equipment

• Refer to Table 4.2-3.
• As of October 2005 there were four stations in the basin.

Reservoirs and Stockponds

• Refer to Table 4.2-4.

• The basin contains two large reservoirs.  The largest is Alamo Lake, with a maximum capacity of 1,409,000 acre-feet, although normal capacity is less than 500 acre-feet. Uses include flood control and recreation.  Lake Havasu, created by Parker Dam in the Parker Basin, has a maximum capacity of 651,000 acre-feet.  Storage for this reservoir is primarily in the Lake Havasu and Sacramento Basins.

• Surface water is stored or could be stored in 19 small reservoirs in the basin.

• There are 796 registered stockponds in this basin.

Runoff Contour

• Refer to Figure 4.2-4.
• Average annual runoff is one inch per year, or 53.3 acre-feet per square mile, in the center of the basin around Bagdad and decreases to 0.1 inches, or 5.33 acre-feet per square mile, in the southwestern portion of the basin.

Click to view Table 4.2-3 Flood ALERT Equipment in the

Bill Williams Basin

Click to view Table 4.2-4 Reservoirs and Stockponds in the

Bill Williams Basin

Click to view Figure 4.2-4 Bill Williams

Basin Surface Water Conditions

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