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<br />~.. (")'? '] <br />..... - ..~..~ <br /> <br />. <br /> <br />. <br /> <br />. . <br /> <br />channel varies from 20 to 40 feet in width and from one to <br /> <br />two feet in depth. Towards the bottom of this segment the <br /> <br />stream cuts into old alluvial deposits, creating bare cut- <br /> <br />banks five to 20 feet in height. These cutbanks are <br /> <br />unstable and contribute some sediment to the stream during <br /> <br />periods of high water. The volume of water is ihcreased <br /> <br />throughout this segment as tributaries from Gem Lake and <br />portions of the Seven Lakes country enter the Main Fork. <br />The valley floor in this area averages ~ mile in width. <br /> <br />At a point near the junction of the West Fork Trail and the <br /> <br />Main Fork Trail, the Main Fork makes a major transition; the <br /> <br />stream gradient steepens to 135 feet per mile arid plunges <br /> <br />for the next five and half miles down a narrow valley that, <br /> <br />on the average, is never more than several feet wider than <br /> <br />the stream itself. As it flows through this segment the <br /> <br />Main Fork becomes a rushing mountain stream, relatively <br /> <br />straight and steep. The stream bottom varies from sand to <br /> <br />large boulders with rock eight to 12 inches in diameter <br /> <br />dominating. The stream averages 30 feet in width at the <br />upper end of this segment and 50 feet in width towards the <br />bottom. Average high water depth is two to three feet, <br /> <br />however, since the channel is deeper towards the center, banks <br /> <br />are rarely over- two feet in height. Stream banks are stable <br />