Streamflow data, including average seasonal flow, average annual flow and other information is shown in Table 3.13-2.  This basin does not contain Flood ALERT equipment.  Reservoir and stockpond data, including maximum storage or maximum surface area, are shown in Table 3.13-3.   The location of streamflow gages identified by USGS number, USGS runoff contours and large reservoirs are shown on Figure 3.13-5.  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 3.13.5 - Perennial/Intermittent Streams and Springs and Section 3.0.2 - Surface Water Hydrology. Where available, the header for each section provides a link to the data web site.  

Streamflow Data

• Refer to Table 3.13-2.

• Data from 13 stations on seven watercourses are shown on the table and on Figure 3.13-5.  Three stations have been discontinued and 10 are real-time stations.

• The average seasonal flow for almost all the stations is highest in the Fall (Oct.-Dec.) of the Summer (July-September) and lowest in Spring (April-June).

• Maximum annual flow was 102,107 acre-feet in 1984 at the San Pedro River near Tombstone and minimum annual flow was 0 acre-feet at Greenbush Draw near Palominas in 2001.  The oldest operating gage is the San Pedro River at Charleston.  A hydrograph of this gage is found in Figure 3.13-4.

Reservoirs and Stockponds

• Refer to Table 3.13-3.
• Surface water is stored or could be stored in four small reservoirs in the basin.
• There are 974 registered stockponds in this basin.

Runoff Contour

• Refer to Figure 3.13-5.
• Average annual runoff is 0.5 inches, or 26.65 acre-feet per square mile, in this basin.

Click to view Table 3.13-2 Streamflow Data for the

Upper San Pedro Basin

Click to view Figure 3.13-4 Annual Flow (in acre-feet) at San Pedro River at Charleston (Station #9471000) Water Years 1905-2007

Click to view Table 3.13-3 Reservoirs and Stockponds in the

Upper San Pedro Basin

Click to view Figure 3.13-5 Upper San Pedro Basin

Surface Water Conditions

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