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This Report Is Also Available in Adobe U.S. Department of the Interior U.S. Geological Survey Water Quality of Rob Roy Reservoir and Lake Owen, Albany County, and Granite Springs and Crystal Lake Reservoirs, Laramie County, Wyoming, 1997-98 By Kathy Muller Ogle1, David A. Peterson1, Bud Spillman2, and Rosie Padilla2 Water-Resources Investigations Report 99-4220 Prepared in cooperation with the Cheyenne Board of Public Utilities 1U.S. Geological Survey 2Cheyenne Board of Public Utilities Cheyenne, Wyoming 1999 U.S. Department of the Interior Bruce Babbitt, Secretary U.S. Geological Survey Charles G. Groat, Director Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government For additional information write to: District Chief U.S. Geological Survey, WRD 2617 E. Lincolnway, Suite B Cheyenne, Wyoming 82001-5662 Copies of this report can be purchased from: U.S. Geological Survey Branch of Information Services Box 25286, Denver Federal Center Denver, Colorado 80225 Information regarding the programs of the Wyoming District is available on the Internet via the World Wide Web. You may connect to the Wyoming District Home Page using the Universal Resource Locator (URL): http://wy.water.usgs.gov CONTENTS Page Abstract ............................................................................................................................................................................... 1 Introduction......................................................................................................................................................................... 1 Purpose and scope ................................................................................................................................................... 3 Description of water system .................................................................................................................................... 3 Description of area................................................................................................................................................... 3 Acknowledgments ................................................................................................................................................... 3 Data Collection ................................................................................................................................................................... 6 Water Quality ...................................................................................................................................................................... 7 Rob Roy Reservoir ................................................................................................................................................. 7 Profiles ......................................................................................................................................................... 13 Phytoplankton .............................................................................................................................................. 13 Chemical quality .......................................................................................................................................... 16 Bottom sediment .......................................................................................................................................... 16 Lake Owen .............................................................................................................................................................. 22 Profiles ......................................................................................................................................................... 22 Phytoplankton .............................................................................................................................................. 24 Chemical quality .......................................................................................................................................... 25 Bottom sediment .......................................................................................................................................... 26 Granite Springs Reservoir ...................................................................................................................................... 27 Profiles ......................................................................................................................................................... 27 Phytoplankton .............................................................................................................................................. 29 Chemical quality .......................................................................................................................................... 31 Bottom sediment .......................................................................................................................................... 31 Crystal Lake Reservoir ........................................................................................................................................... 34 Profiles ......................................................................................................................................................... 34 Phytoplankton .............................................................................................................................................. 38 Chemical quality .......................................................................................................................................... 39 Bottom sediment .......................................................................................................................................... 40 Comparison among reservoirs................................................................................................................................. 44 Profiles ......................................................................................................................................................... 44 Phytoplankton .............................................................................................................................................. 44 Chemical quality .......................................................................................................................................... 47 Bottom sediment .......................................................................................................................................... 47 Summary ............................................................................................................................................................................. 48 References cited .................................................................................................................................................................. 50 Appendix A--Profile data Profile data for Rob Roy Reservoir ......................................................................................................................... A1 Profile data for Lake Owen ..................................................................................................................................... A12 Profile data for Granite Springs............................................................................................................................... A24 Profile data for Crystal Lake Reservoir................................................................................................................... A40 Appendix B--Phytoplankton data Table B1. Phytoplankton density and biomass, Rob Roy Reservoir ...................................................................... B1 Table B2. Phytoplankton density and biomass, Lake Owen .................................................................................. B4 Table B3. Phytoplankton density and biomass, Granite Springs Reservoir ........................................................... B8 Table B4. Phytoplankton density and biomass, Crystal Lake Reservoir................................................................ B12 CONTENTS iii FIGURES Page 1. Map showing location of Rob Roy Reservoir and Lake Owen, Albany County, and Granite Springs and Crystal Lake Reservoirs, Laramie County, Wyoming .................................................................................... 2 2. Maps showing location of sampling sites in Rob Roy Reservoir and Lake Owen, Albany County, and Granite Springs and Crystal Lake Reservoirs, Laramie County, Wyoming ................................................... 4 3-7. Graphs showing: 3. Temperature, dissolved oxygen, specific conductance and pH profiles of Rob Roy Reservoir, Albany County, Wyoming..................................................................................................................... 14 4. Secchi disk transparency depths in 1998 for Rob Roy Reservoir and Lake Owen, Albany County, and Granite Springs and Crystal Lake Reservoirs, Laramie County, Wyoming................................... 15 5. Temporal variation of temperature with depth in Rob Roy Reservoir, Albany County, Wyoming in summer and fall, 1998...................................................................................................... 16 6. Phytoplankton biomass changes over time in Rob Roy Reservoir, Albany County, Wyoming ..............
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