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<br />1 <br />1 <br /> <br />1 <br /> <br /> <br />1 <br /> <br />Location: Mohave County AZ and Clark County NV <br />Geographic Boundary. Hoover Dam to Davis Dam <br />Description of Habitats Available: This is a 61 km long reservoir with a 35 <br />km riverine section in the Black Canyon below Hoover Dam. Flows are <br />controlled by releases from Hoover Dam. Hourly and daily fluctuations in <br />releases dominate the riverine reach, and the reservoir fluctuates up to 5 <br />meters during a normal year. Riverine habitats include riffles, runs, pools, <br />and shoreline eddies and bars. Reservoir habitats include deep water, <br />and numerous bays and coves that provide sheltered, shallow water <br />habitats. In the riverine reach there are several small spring inflows to the <br />system. There are no tributaries that provide water inflows except during <br />runoff events. <br />Land Ownership/Management Agencies: The National Park Service (Lake <br />' Mead National Recreation Area) has broad resource management <br />responsibilities within the boundaries of the National Recreation area. <br />' Water levels of Lake Mohave are controlled by USBR, Boulder City, <br />Nevada. Nevada Department of Wildlife and AGFD are the leads for fish <br />and wildlife management, in coordination with other agencies. <br />' Species/Habitat Present: Bonytail and razorback sucker are present. <br />Critical habitat for both species is designated within the reach (USFWS <br />1994a). <br />Bon ail <br />' Current Status and Recovery Efforts: Wild populations of bonytail are <br />virtually extinct in the Colorado River basin (Minckley 1973) with 113 <br />' collected between 1980 and 2003 from Lake Mohave (Minckley and <br />Thorson 2002). Fourteen of those fish were considered wild. Since 1981, <br />200,205 bonytail have been stocked in Lake Mohave. Eighty-five percent <br />of these fish were <25 cm; 15% were larger. The Service is also currently <br />working toward fulfilling the terms of a biological opinion to stock 125,000 <br />a <br />20 <br />4 <br />LAKE MOHAVE SUBUNIT ` <br />Background Information <br />