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<br />tl_~"Il4"\l~ <br />.,) '\..-' --':...~ -"- <br /> <br />Hydrologic and Water-Quality Data, <br />Guanella Pass Area, Colorado, <br />Water Year 1995 <br /> <br />By Michael R. Stevens, David A. Johncox, and Jennifer R. Cox <br /> <br />Abstract <br /> <br />Water quality of streams and lakes in the <br />Guanella Pass area could be affected by the <br />proposed reconstruction of the existing road <br />through the area. During water year 1995 <br />(October 1,1994, to September 30,1995), <br />data were collected that provide reconnaissance <br />information about the hydrology, water quality, <br />sediment transport, biology, and bulk <br />atmospheric-deposition in the Guanella Pass <br />study area. Data were collected at 5 stream <br />monitoring stations, 23 synoptic-stream sites, <br />II road-runoff sites, 8 ground-water sites, <br />4 lake/reservoir sites, 2 snow-precipitation <br />sites, II biological sampling sites, and 12 bulk <br />atmospheric-deposition sites. <br /> <br />INTRODUCTION <br /> <br />In 1994, the u.s. Geological Survey (USGS) <br />began a study of the Guanella Pass area in cooperation <br />with the Federal Highway Administration (FHW A). <br />The FHW A is proposing to reconstruct and resurface <br />the existing road over Guanella Pass between <br />Georgetown and Grant, Colo. Water quality of streams <br />and lakes in the area could be affected by the proposed <br />reconstruction. The USGS studies are part of the <br />environmental investigation being conducted by the <br />FHW A. <br /> <br />Purpose and Scope <br /> <br />This report presents data collected during water <br />year 1995 (October 1,1994, to September 30,1995) <br />and the methods of data collection. During water <br />year 1995, data that provide reconnaissance informa- <br />tion about the hydrology. water quality, sediment <br />transport, biology. and bulk atmospheric deposition <br />were collected in the Guanella Pass study area (fig. I). <br />Data were collected at 5 stream-monitoring stations. <br />23 synoptic-stream sites. II road-runoff sites, <br />8 ground-water sites, 4 lake/reservoir sites. 2 snow- <br />precipitation sites. II biological sampling sites, and <br />12 bulk atmospheric-deposition sites. <br />Data presented in this report include field <br />measurements of streamflow, specific conductance, <br />pH. water temperature, turbidity, barometric pressure, <br />and dissolved oxygen; concentrations of selected <br />inorganic and organic constituents; suspended- <br />sediment concentration and particle-size analyses; taxa <br />and densities of macroinvertebrates and periphyton; <br />and solids and chemical concentrations of bulk <br />atmospheric deposition. Daily values for streamflow, <br />maximum and minimum water temperature. and <br />specific conductance were computed at five <br />monitoring stations. <br /> <br /> <br />Acknowledgments <br /> <br />The assistance of others in the completion of <br />this study was invaluable. Many of the data-collection <br />tasks were perfonned by John Dick. Cristin Dyster, <br />and other members ofthe USGS in Lakewood, Colo. <br /> <br />Abstract 1 <br />