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<br />001085 <br /> <br />. <br /> <br />. <br /> <br />TABLE OF CONTENTS <br /> <br />Introduction...................................................................................................... 1 <br />Project Purpose.......................................... ..... ....... .................. ......... ....... .. 1 <br />Project Description................ ...................... ............... ........................................ 1 <br />Existing ElkheadDam and Reservoir ............................................................... 1 <br /> <br />Physical Facilities ............................... ........... .................... .................. 1 <br />Reservoir Operations........................................................................... 3 <br />Proposed Elkhead Dam and Reservoir Enlargement ............................................. 4 <br /> <br />Physical Facilities:.............................................................................. 4 <br />Reservoir Operations .................................... ............... .........................4 <br />Threatened, Endangered and Candidate Species .......................................................... 7 <br /> <br />Terrestrial Species...................................................................................... 7 <br />Bald Eagle (Haliacetus luecocephalus)...................................................... 7 <br />Peregrine Falcon (Falco peregrinus) ........................................................7 <br />Ferruginous Hawk (Buteo regalis)........................................................... 8 <br />Black Footed Ferret (Mustela nigripes)..................................................... 8 <br /> <br />Aquatic Species.......................................................................................... 8 <br />Colorado Squawfish (Ptychocheilus lucius)................................................ 9 <br />Humpback Chub (Gila cypha) .............................................................. 10 <br />Razorback Sucker (Xyrauchen texanus) .................................................. 10 <br />Bony tail Chub (Gila elegans) ............................................................... 10 <br />On-Site Impacts of Project Construction ........................ ..................... .................... 11 <br />Reservoir Inundation Area .......................................................................... 11 <br /> <br />Enlarged Embankment............................................................................... 12 <br />Emergency Spillway ................. ............................................ .....................12 <br />Recreational and Other Facilities .................................................................. 12 <br /> <br />Road Relocation'....................................................................................... 13 <br />Hydrology...................................................................................................... 13 <br />Yampa River and Elkhead Creek Hydrology.................................................... 13 <br />USFWS - HYDROSS Model................................................................ 13 <br />USFWS - Flow Recommendations ........................................................ 15 <br />HydrosphereYampa River Basin Model................................................. 15 <br />Pre-Project Conditions.... ................................ ............ .......................... ..... 16 <br />Elkhead Reservoir ............................................. ........... ....... ........ ...:. 16 <br /> <br />Elkhead Creek ..... ..................................... ..... .................... .............. 16 <br />Yampa River - Maybell...................................................................... 19 <br /> <br />Post-Project Conditions ........... ............................. .................... ... ............... 19 <br />Elkhead Reservoir ............................................................................ 25 <br /> <br />Elkhead Creek.... ............ ........................... ....................... ............... 25 ' <br />Yampa River - Maybell...................................................................... 25 <br />Future Streamflow Conditions Without Project................................................. 34 <br />Fish Passage in the Yampa River .......................................................................... 35 <br /> <br />Water Quality.....:.......... .......... ................................................... ..................... 35 <br />Elkhead Creek and Reservoir....................................................................... 35 <br /> <br />Dissolved Oxygen............................................................................. 36 <br />Water Temperature............... ........ ....................... ............................. 36 <br />Suspended Sediment.......................................................................... 36 <br />Yampa River at Maybell............................................................................. 36 <br /> <br />Dissolved Oxygen............................. ................................................. 37 <br />Water Temperature ... .............................................................. .......... 37 <br /> <br />ii .~; 'i <br />