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Fork of the Gunnison watershed from the Crystal River water- <br /> shed . Drainage from the east side of Huntsman Ridge flows <br /> east in Coal Creek to the Crystal River , then north to the <br /> confluence of the Crystal and Roaring Fork River rear Carbondale , <br /> approximately 17 miles north of Coal Basin . The Roaring <br /> Fork flows northwest to the confluence with the Colorado <br /> River at Glenwood Springs . <br /> The drainage on the west side of Huntsman <br /> Ridge consists of tributaries flowing west and south, forming <br /> the Clear Fork and East Muddy Creek drainage system. The <br /> East Muddy Creek flows south to the North Fork of the Gunnison, <br /> which then flows westward to join with the South Fork of the <br /> Gunnison to form the main Gunnison River . The Gunnison <br /> River joins the Colorado River in Grand Junction, approximately <br /> 70 miles west of the Coal Basin facilities . (See Exhibit <br /> III-E-1) <br /> b . Information sources <br /> A major source of information in evaluating <br /> surface hydrology of Coal Basin and adjacent area has been <br /> the United States Geological Survey (USGS) stream gauging <br /> records . The gauging records were used to evaluate stream <br /> low and peak flow characteristics . In addition , standard <br /> methods such as flow duration , flood regression , and basin <br /> runoff analyses were performed to quantify regional basin <br /> runoff characteristics . Methods and data utilized in designing <br /> site specific drainage control structures were the following : <br /> 27 <br />