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1 <br />1 <br />1 <br /> <br /> <br />1 <br />1 <br /> <br /> <br /> <br />PARKER-IMPERIAL SUBUNIT <br />Background Information <br />Location: t_a Paz and Yuma Counties AZ, San Bernardino, Riverside, and <br />Imperial Counties, CA <br />Geographic Boundary: Parker Dam to Imperial Dam <br />Description of Habifats Available: This is a 250 km riverine reach with <br />backwaters and fringe marshes scattered along its length. Flows are <br />controlled by releases from Parker Dam and include significant hourly and <br />daily fluctuations that attenuate downstream. Main channel habitats <br />include runs, shoreline bars and eddies, and occasional areas of braided <br />channel where sediment loads have been deposited. Many shorelines <br />have been stabilized and some reaches have been channelized. Behind <br />the diversion dams in the reach (Headgate Rock, Palo Verde, Imperial), <br />water is ponded to form small flow-through lakes. There are significant <br />areas of marshes and backwaters, but no perennial tributary streams. <br />Land Ownership/Management Agencies: The BLM owns some shoreline <br />' lands, and there are several recreational areas including State Parks in <br />the reach. The Service has two refuges (Cibola NWR and Imperial <br />NWR). The Colorado River Indian Tribes are a major landowner. Much <br />' of the remainder is privately owned. Water flows in the river are controlled <br />by USBR, Boulder City, Nevada who is also responsible for channel <br />maintenance activities. California Department of Fish and Game and <br />' AGFD are the leads for fish and wildlife management, in coordination <br />- other agencies. <br />' Species/Habitat Present: Razorback sucker is present with critical habitat <br />for this species designated within the reach (USFWS 1994a). <br />' Reintroduction of bonytail to this subunit is under consideration. This <br />reach was considered for establishment of an experimental non-essential <br />population of Colorado pikeminnow. <br />' Bon ail <br /> _. <br />' , 29 <br />r~ <br />