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Surface Water Conditions in the Lower San Pedro Basin

Streamflow data, including average seasonal flow, average annual flow and other information is shown in Table 3.8-2.  Flood ALERT equipment in the basin is shown on Table 3.8-3.  Reservoir and stockpond data, including maximum storage or maximum surface area, are shown in Table 3.8-4.   The location of streamflow gages identified by USGS number, flood ALERT equipment and USGS runoff contours are shown on Figure 3.8-5.  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 3.8.5 - 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 3.8-2.
  • Data from 11 stations on four watercourses are shown on the table and on Figure 3.8-5.  Eight stations have been discontinued and the remaining three are real-time stations.

  • The average seasonal flow for most stations is highest in the Summer (July-September) and lowest in the Spring (April-June).

  • Maximum annual flow in this basin was 2,375,969 acre-feet in 1993 on the Gila River and minimum annual flow was 17 acre-feet in 1969 on the Peck Canyon tributary. 

  • Figure 3.8-4 is a stream hydrograph showing long-term flow at Aravaipa Creek near Mammoth.

Flood ALERT Equipment

  • Refer to Table 3.8-3.
  • There are four stations in the basin as of October 2005. 

Reservoirs and Stockponds

  • Refer to Table 3.8-4.
  • There are seven small reservoirs in this basin.
  • There are 648 registered stockponds in this basin.

Runoff Contour

  • Refer to Figure 3.8-5.
  • Average annual runoff varies from 0.5 inches per year, or 26.65 acre-feet per square mile, in the vicinity of the San Pedro River to one inch per year, or 53.3 acre-feet per square mile on the eastern and western boundaries of the basin.

Click to view Table 3.8-2

Click to view Table 3.8-2 Streamflow Data for the

Lower San Pedro Basin

Click to view Figure 3.8-4

Click to view Figure 3.8-4 Annual Flows (in acre-feet) at Aravaipa Creek near Mammoth (Station #9473000) Water Years 1932-2007

Click to view Table 3.9-3

Click to view Table 3.8-3 Flood ALERT Equipment in the Lower San Pedro Basin

Click to view Table 3.8-4

Click to view Table 3.8-4 Reservoirs and Stockponds in the Lower San Pedro Basin

Click to view Figure 3.8-5

Click to view Figure 3.8-5 Lower San Pedro Basin

Surface Water Conditions

 

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