Laserfiche WebLink
July 1993 -8- 923-2515 • <br />An alluvial fan has been mapped near the downstream portion of this azea in the S W ~/. sec. 33, <br />'C. 6 N., R. 87 W. This alluvial fan is situated at the mouth of a primary, ephemeral tributary. <br />The remainder of the drainage to the confluence with Scotchman's Gulch has been mapped as <br />alluvium. This is a broad,. flat area of approximately 20 acres, which exhibits a decreased <br />stream gradient and a distinct break in slope with respect to the adjacent side slopes. <br />3.3 Unnamed Drainaee <br />Similar to other drainages in this region, the headwaters of the unnamed drainage are situated <br />in clefts between hillocks. The narrow channels have been mapped'. as undifferentiated valley <br />fill. The adjacent slopes have been mapped as colluvium. A large area of approximately 35 <br />acres, upstream of the Nofstger Reservoir has also been mapped as undifferentiated valley fill. • <br />This area is somewhat broad with irregular topography which prohibits distinction between <br />alluvial deposits and colluvium. Undifferentiated valley fill comprising approximately 25 acres, <br />has been mapped downstream of the Nofstger Reservoir in the NE'/. sec. 4, T. 5 N., R. 87 W., <br />to a point where a small azea (less than 8 acres) of alluvium has been mapped. At the upstream <br />end of this alluvial section aze two alluvial fans. <br />The remainder of the drainage from the southwest comer of sec. 34, T.6 N., R. 87 W. to <br />approximately 1000 feet upstream of the confluence of the unnamed drainage with Scotchman's <br />Draw has been mapped as undifferentiated valley fill, an area of approximately 20 acres. This <br />reach of the drainage exhibits a narrow channel that is lithologically controlled. Outcrops of the <br />Twenty-Mile Sandstone Member of the Mesaverde Group control the geometry of this reach of <br />the drainage resulting in a narrow channel of low sinuosity. Valley floor deposits in this narrow <br />section of channel are a combination of alluvium and colluvium. <br />- A reach of approximately 1000 feet of the unnamed drainage located upstream from the • <br />confluence with Scotchman's Gulch has been mapped as alluvium covering an area of less than <br />Golder Associates <br />