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BOARD01466
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Last modified
1/27/2010 12:29:34 PM
Creation date
10/4/2006 6:56:06 AM
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Board Meetings
Board Meeting Date
11/20/2000
Description
ISF Section - Instream Flow Recommendations
Board Meetings - Doc Type
Memo
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<br />e <br /> <br />e <br /> <br />e <br /> <br />A?~~ 1::>1)<: H- <br /> <br />GEOLOGICAL SERVICES REPORT <br />- FINAL VERSION - <br /> <br />TO: Greg Kuyumjian, Forest Hydrologist, WRNF <br />FROM: Rusty Dersch <br />SUBJECT: Geology of the Deadhorse Creek Watershed <br /> <br />INTRODUCTION <br /> <br />The purpose of this report is to determine the effect of the geol- <br />ogy on the waterflow in the Deadhorse Creek Watershed. The request <br />for the information was made by Greg Kuyumjian, Forest Hydrologist, <br />White River National Forest, and Jim Maxwell, Regional Hydrologist. <br /> <br />Special thanks to Dave Park, Hydrologist, Regional Office, for hel- <br />ping with this report. <br /> <br />This assessment was completed without the benefit of any field <br />review. <br /> <br />LOCATION <br /> <br />The East and West Forks of Deadhorse Creek flow into the Colorado <br />River and Glenwood Canyon. The Deadhorse CreEik Watershed is loca- <br />ted in T.4-SS., R.87-88W., 6th PM, a portion of the Eagle Ranger <br />District, White River National Forest (Exhibit 1). The Deadhorse <br />drainage is situated on the southeast edge of the White River Up- <br />lift, a domal feature which in part is defined by the Grizzly Creek <br />Fault (GCF). Hanging Lake is a unique area found on the East Fork <br />of Deadhorse Creek. <br /> <br />REGIONAL GEOLOGY <br /> <br />The White River Uplift is a structural feature composed of lower <br />Paleozoic rocks resting on Precambrian basement rocks (Tweto and <br />others, 1978). These Paleozoic rocks consist. principally of lime- <br />stone, sandstone, dolomite, and quartzite. There are two drainages <br />which have deeply incised the sedimentary cover exposing 1.7-1.8 <br />billon year old Precambrian rocks. Gneissic rocks and granite are <br />exposed in No Name and Grizzly Creeks. These creeks are located to <br />the west of the Deadhorse Creek Watershed. <br /> <br />LOCAL GEOLOGY <br /> <br />Kirkham and others (1996) mapped Mississippian thru Cambrian sedi- <br />ments and Precambrian gneiss covered by Quaternary materials on the <br />Shoshone Quadrangle. The sedimentary units includes the Leadville <br />limestone, Chaffee group, Manitou formation, Dotsero formation, and <br />Sawatch quartzite. The Chaffee, Manitou, and Dotsero include units <br />of shale, dolomite, limestone, sandstone, arkosic conglomerate, and <br />
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