skip to the content of this page Arizona's Official Website Arizona Department of Water Resources
Arizona Department of Water Resources Arizona's Official Web Site
Securing Arizona's Water Future
Surface Water Conditions in the Gila Bend Basin

Streamflow data, including average seasonal flow, average annual flow and other information are shown in Table 7.2-2.  Flood ALERT equipment in the basin is shown in Table 7.2-3.  Reservoir and stockpond data, including maximum storage or maximum surface area, are shown in Table 7.2-4. The location of streamflow gages identified by USGS number, flood ALERT equipment, USGS runoff contours and large reservoirs are shown on Figure 7.2-4.  Descriptions of stream, reservoir and stockpond data sources and methods are found in Volume 1, Appendix A. 

Streamflow Data

  • Refer to Table 7.2-2.
  • Data from three stations located at two watercourses are shown in the table and on Figure 7.2-4. 
  • Average seasonal is highest at most stations in the winter (January-March) or spring (April-June).  
  • The largest annual flow recorded in the basin is 5.7 million acre-feet in 1993 at the Gila River below Gillespie Dam station with a contributing drainage area of 49,650 square miles.  Gillespie Dam was breached during the 1993 flood.

Flood ALERT Equipment

  • Refer to Table 7.2-3.
  • As of October 2005 there were nine stations in this basin.

Reservoirs and Stockponds

  • Refer to Table 7.2-4.
  • The basin contains one large reservoir, Painted Rock, with a maximum storage of 4,831,500 acre-feet.  This reservoir is used for flood control and is only filled during flood events.
  • Surface water is stored or could be stored in two small reservoirs in the basin. 
  • There are 24 registered stockponds in this basin.

Runoff Contour

  • Refer to Figure 7.2-4.
  • Average annual runoff is highest, 0.2 inches per year or 10.66 acre-feet per square mile, in the southernmost portion of the basin and decreases to 0.1 inches, or 5.33 acre-feet per square mile, in the remainder of the basin.



Click here for Table 7.2-2

Table 7.2-2 Streamflow Data for the Gila Bend Basin

Click here for Table 7.2-3

Table 7.2-3 Flood ALERT Equipment in the Gila Bend Basin

Click here for Table 7.2-4

Table 7.2-4 Reservoirs and Stockponds in the Gila Bend Basin

Click here for Figure 7.2-4

Figure 7.2-4 Gila Bend Basin Surface Water Conditions


Arizona Water Atlas Home

Lower Colorado River Planning Area Home

References and Supplemental Reading for the Butler Valley Basin

Colorado River
Lower Colorado River Planning Area
Click to download Volume 7