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wildlife production, and other related activities. In addition to these State-owned lands ,there .are numerous small acreages along the South Platte which are leased by the State to provide additional,'access to the river for recreat ioni sts. I Management objectives and activities for the State-owned lands along ~~e South Platte in Nebraska are the s'ame as those outlined 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-w~ter streanas it move,s eastward into the plains. Major speCies are s im1'1 ar to those listed for the North Platte. ' The SOlJth Platte' River above, Denver is listed as a Clas,s 1 stream, providing fish,ing for mostly cold-water. species. The river below ~en\Je:r downstream into Nebraska is 1 i sted as a Cl ass 4 fishery, and receives moderate to light fishing pressure for mostly warm-water species. Threatened and Endan~ered Speci es. -- The greenback cutthroat trout~ttre. only federally listeendangeredfish species which occurs in the South Pl atte Drainage, can be found in a few headwater streams of the FY"ont I Range in Colorado. The State 01; Colorado lists two species the SouthPla1ite drainage as threatened. which maybe. found in the South Platte as shown in table 4. of darters found in' waters 'of Nebraska 1 i sts several specles ' threatened. These species are,' THE HYDROLOGIC SYSTEM The hydr()log1c system in the ,Upper Platte River Basin is very'compl~x. , The natural flow of the North Platte and South Platte Rivers is affected by transmountain and intrabasin diversionst 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 located throughout the study area wi th 1 arge reservoirs on or adjacent to the two major forks. Generally, the reservoirs with larger storagecap'acities 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 argestnumber of these storage reservoirs is for irrigation; power" ranks second; flood control and storageformtmicipalandindustrial use follow. Nearly all. the reservoirs serve recreation and fish and wild- life uses. 18