Perennial/Intermittent Streams and Springs in the Grand Wash Basin

Major and minor springs with discharge rates and date of measurement, and the total number of springs in the basin are shown in Table 6.2-2.  The locations of major springs and one perennial stream are shown on Figure 6.2-5.   Descriptions of data sources and methods for intermittent and perennial reaches and springs are found in Volume 1, Appendix A.

• There are no intermittent streams and the only perennial stream is the Colorado River, which is impounded at Hoover Dam, and forms Lake Mead in this basin.
• There are six major springs with a measured discharge of 10 gallons per minute (gpm) or greater at any time.  The largest discharge rate is 75 gpm at Tassi spring.
• Springs with measured discharge of 1 to 10 gpm are not mapped but coordinates are given in Table 6.2-2B.  There are nine minor springs in this basin.
• Listed discharge rates may not be indicative of current conditions. 
• The total number of springs, regardless of discharge, identified by the USGS varies from 47 to 52, depending on the database reference.

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