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wildl ife production, and other related activities. In addition to these State-owned 1 ands, there are numerous small acreages along the South Platte which are leased by the State to provide additional access to the river for recreationists. Management object i ves and act i vit i es for the State-owned 1 ands a long the South Pl atte in Nebraska are the same as those outl ined for the North Platte River in that State. Fishery Resources Like the North Platte River, the South Platte originates as a cold-water stream in the mountains of Colorado, and becomes primarily a warm-water stream as it moves eastward into the plains. Major species are similar to those listed for the North Platte. The South Platte River above Denver is listed as a Class 1 stream, providing fishing for mostly cold-water species. The river below Denver downstream into Nebraska is listed as a Class 4 fishery, and receives moderate to light fishing pressure for mostly warm-water species. Threatened and Endan~ered Speci es . --The greenback cutthroat trout, the only federally llste endangered fish species which occurs in the South Pl atte Drainage, can be found in a few headwater streams of the Front Range in Colorado. The State of Colorado 1 ists two species the South Platte drainage as threatened. which may be found in the South Platte as shown in table 4. of darters found in waters of Nebraska lists several species threatened. These species are THE HYDROLOGIC SYSTEM The hydrologic system in the Upper Platte River Basin is very complex. The natural flow of the North Platte and South Platte Rivers is affected by transmountain and intrabasin diversions, storage reservoirs, power developments, diversions for irrigation, municipal and industrial use, ground-water withdrawals, and return flow from irrigated areas. Storage Reservoirs Storage reservoirs are 1 ocated throughout the study area with 1 arge reservoirs on or adjacent to the two major forks. Generally, the reservoirs with larger storage capacities are onstream; offstream reservoirs, for the most part, have smaller capacities. The storage capacity of all reservoirs having individual capacities of 5,000 acre- feet or more totals nearly 7 million acre-feet. Table 5 lists these reservoirs by study subarea and capacity. The principal purpose of the 1 argest number of these storage reservoirs is for irrigation; power ranks second; flood control and storage for municipal and industrial use follow. Nearly all the reservoirs serve recreation and fish and wild- 1 ife uses. lB