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July 1993 -10- 923-2515 • <br />The narrow reach of Grassy Creek between the landslide and the northern boundary of sec. 34, <br />T. 6 N., R. 87 W. has been mappe<t as undifferentiated valley fill with the exception of the <br />small azea (less than 5 acres) of alluvium adjacent to and downstream from the landslide that has <br />been mapped as alluvium. :Immediately south of the northern section line of sec. 34, T. 6 N., <br />R. 87 W. is an broad flat ;u'ea of approximately 25 acres that has been mapped as alluvium <br />(Figure 1). Adjacent to this area is an area mapped as recent anihropogenic fill. Downstream <br />from the azea of fill to the confluence with the unnamed drainage in the SW'/. sec. 28, T. 6 N., <br />R. 87 W., is an area that has been mapped as undifferentiated valley fill covering approximately <br />15 acres. <br />The area of less than 15 acres in the vicinity of the confluence of Grassy Creek and Scotchman's <br />Gulch in the SE'/. sec 28, T. 6 N., R. 87 W., has been mapped as alluvium. This is a broad, <br />flat area exhibiting a sharp break in slope with the adjacent sideslopes. The channel throughout • <br />this section meanders considerably. <br />Downstream from the confluence of Scotchman's Gulch and Grassy Creek (Figure 1) is a reach <br />of Grassy Creek that has been mapped as undifferentiated valley fill covering an area of <br />approximately 20 acres. This is a narrow section of channel where sideslopes and valley floor <br />are not easily distinguished. Two alluvial fans have been mapped in this reach of Grassy Creek. <br />Downstream from this reach of Grassy Creek to the confluence with the Yampa River aze two <br />azeas of alluvium covering approximately 50 acres. Where the valley narrows in two reaches <br />of this portion of the drainage (sec. 16, T. 6 N., R. 87 W.), colluvium is not easily <br />distinguished from alluvial deposits. These two sections covering less than 10 acres have been <br />mapped as undifferentiated valley fill. Two azeas of undifferentiated valley fill covering less <br />than 5 acres have also been mapped in the tributary to Grassy Creek at the boundary between <br />sections 21 and 28, T. 6 N., R. 87 W. and the tributary located in the eastern half sec. 21, T. <br />6 N., R. 87 W. <br />• <br />Golder Associates <br />