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<br />floodplain vegetation, and sediments originating from mine waste piles may also be toxic or <br />unsuitable to natural vegetations. The transport of large boulders through the area during high <br />flows could also cause damage to hydraulic structures in the area including the masonry flume. <br /> <br />Mine timbers, cribbing, and natural woody debris is scattered throughout Upper Willow Creek. <br />This debris will be easily mobilized during a flood event and could quickly plug or damage <br />culverts, bridges, or flumes. Timber debris may be the most immediate risk to flood damage in <br />Upper Willow Creek, and may also be one of the easiest problem to fix. <br /> <br />This study identified sediment sources in the Upper Willow Creek watershed and evaluated the <br />potential for these sediments to be transported into Willow Creek. Sediment transport was <br />evaluated to examine locations of high sediment transport and potential sedimentation rates. The <br />amount of timber debris within creek channel throughout the study area was also briefly <br />examined. <br /> <br />1-8 <br />