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

Tucson AMA Surface Water Conditions

Streamflow data, including average seasonal flow, annual flow and other information are shown in Table 8.5-2.  Flood ALERT equipment in the AMA is shown in Table 8.5-3.  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 8.5-4. The location of streamflow gages identified by USGS number, flood ALERT equipment, USGS runoff contours and large reservoirs are shown on Figure 8.5-4. Descriptions of stream, reservoir and stockpond data sources and methods are found in Volume 1, Appendix A.

Streamflow Data

  • Refer to Table 8.5-2.
  • Data from 32 stations located at 18 watercourses are shown in the table and on Figure 8.5-4
  • Average seasonal flow is highest at most stations in the summer season (July-September), although watercourses originating in the Santa Catalina and Rincon mountains experience peak flows in the winter season (January-March). 
  • The largest annual flow recorded in the AMA is 182,136 acre-feet in 1993 at the Santa Cruz River at Cortaro gage with a contributing drainage area of 3,503 square miles. 

Flood ALERT Equipment

  • Refer to Table 8.5-3.
  • There are 74 ALERT gages in the Tucson AMA.

Reservoirs and Stockponds

  • Refer to Table 8.5-4.
  • The AMA contains three large reservoirs.  The largest, Arivaca, has a maximum storage of 2,915 acre-feet.
  • All reservoirs are used for recreation. 
  • Surface water is stored or could be stored in 36 small reservoirs.
  • There are 1,538 registered stockponds in the Tucson AMA.

Runoff Contour

  • Refer to Figure 8.5-4.
  • Average annual runoff is highest, two inches per year or 106.7 acre-feet per square mile, in the eastern portion of the AMA and decreases to 0.1 inches, or five acre-feet per square mile, in the northwestern portion of the AMA.

Click to view Table 8.5-2

Table 8.5-2 Streamflow Data in the Tucson AMA

Click to view Table 8.5-3

Table 8.5-3 Flood ALERT Equipment in the Tucson AMA

Click to view Table 8.5-4

Table 8.5-4 Reservoirs and Stockponds in the Tucson AMA

Click to view Figure 8.5-4

Figure 8.5-4 Tucson AMA Surface Water Conditions


Arizona Water Atlas Home

Active Management Area Water Atlas Home

Download pdf of the Tucson AMA

Colorado River

Click to download Volume 8

Downtown Tucson
Sabino Canyon