Major and minor springs with discharge rates and date of measurement, and the total number of springs in the basin are shown in Table 3.8-5.  The locations of major springs as well as perennial and intermittent streams are shown on Figure 3.8-6.   Descriptions of data sources and methods for intermittent and perennial reaches and springs are found in Volume 1, Appendix A.  Additional information on surface water in this basin can be found in Section 3.8.4 - Surface Water Conditions and Section 3.0.2 - Surface Water Hydrology.

• A number of perennial and intermittent streams are located throughout the basin.

• The San Pedro River is perennial south of Dudleyville and in its southern reach in the planning area.

• There are 13 major springs with a measured discharge of 10 gallons per minute (gpm) or greater at any time. The largest discharge is 1,000 gpm at Cooks Lake spring.

• Springs with measured discharge of 1 to 10 gpm are not mapped but coordinates are given in Table 3.8-5.  There are 30 minor springs identified in this basin.

• Listed discharge rates may not be indicative of current conditions.  Most of the measurements were taken prior to 1990 and many of the major spring measurements were taken in the 1950s.  Only four minor spring measurements post-date 1990.

• The total number of springs identified by the USGS varies from 203 to 209, depending on the database reference.

Click to view Table 3.8-5 Springs in the Lower San Pedro Basin

Click to view Figure 3.8-6 Lower San Pedro Basin Perennial/Intermittent Streams and Major (>10gpm) Springs

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