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• 2:04.7 (2) (b) (i) <br />Sylvester Gulch is an ephemeral stream with a drainage area <br />of approximately 4.3 square miles (2,720 acres). From the <br />upper reach of the drainage basin at an elevation of 8,290 <br />feet DISL, Sylvester Gulch flows for approximately 3.4 miles <br />to its confluence with the North Fork of the Gunnison River <br />at an elevation of 6,070 feet MSL. A stream gaging station <br />has been installed approximately 1,300 feet upstream from <br />the confluence with the North Fort. of the Gunnison River and <br />1.6 miles east of Somerset. <br />Sylvester Gulch and the other small ephemeral stream in the <br />north end of the area (south of the North Fork of the Gunnison <br />River) provide an extremely small portion of the total flow in <br />• the Dlorth Fork of the Gunnison River. Limited information on <br />the Sylvester Gulch flow is currently available, and is shown <br />in Table 2.04.7(2)(b)(i)-1. <br />The flow in the North Fork is moderated somewhat by Paonia <br />Reservoir which was filled starting in 1961. From 1967 to <br />1974 the maximum and minimum flows recorded at the C. S. <br />Geological Survey gauging station (9-1325) near Somerset <br />were 5,100 cfs (cubic feet per second; tray 20, 1973) and <br />40 cfs (January 7, 1968 and January 24, 1969). Coal Creek <br />and Anthracite Creek join the North Fork of the Gunnison <br />River below Paonia Reservoir. These major tributaries <br />contribute to the wide fluctuation in flow rates in the river <br />despite the moderating influence of the reservoir. See <br />Figure 2.04.5(1)(b) For a plot of stream flow records <br />in the North Fork of the ^.u^nison River. <br />• <br />5-45 <br />