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• SECTION 2 <br />ALLUVIAL VALLEY FLOOR INVESTIGATIONS <br />Cottonwood Creek <br />Reconnaissance Level Investigation. The entire Cottonwood <br />Creek drainage was surveyed according to the reconnaissance <br />investigation procedures in the Alluvial Valley Floor Guideline <br />(Department of Interior, Office of Surface Mining, 1980). <br />Cottonwood Creek did not meet the geomorphic characteristics <br />necessary for a valley to be an AVF. The Cottonwood Creek <br />terraces are generally narrow (10-20 feet) and the topography is <br />too rough to consider developing the bottomland for farming. <br />• Rapid Creek <br />Geomorphic Mapping. The dominant landform present in the <br />lower reaches of Rapid Creek is an extensive mudflow fan. The <br />fan is composed of large basalt boulders and cobbles in a matzix <br />of finer material. The poor sorting of the fan materials, the <br />size of the larger boulders, and the configuration of this lobe <br />of debris protruding from the mouth of Rapid Creek suggests the <br />origin of the fan is from a mudflow. <br />Rapid Creek has altered the original fan surface by down <br />cutting, leaving three terraces or remnants of p=evious valley <br />floor locations (See Map 1). The Tl terrace was not mapped, <br />but includes the present stream channel and associated <br />• <br />2 <br />