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Stream Upper Missouri Mainstem Subbasin Upper Missouri River, Montana Milk River, Montana Beaverhead River, Montana Big Hole River, Montana Gallatin River, Montana Madison River, Montana Yellowstone River Subbasin Tongue River, Wyoming Yellowstone River, Montana Clarks Fork, Wyoming Powder River, WYOll1ing Wind River, Wyoming Yellowstone River, Montana Western Da!..,-tas SUbbasin Heart River, North Dako ta Knife River, North Dakot.... Little Missouri River, North Dakota Missouri River Mainstem, North Dakota Spring Creek, North Uakota :Belle Fourche River, South D<lkota Cannonball River, North Dakota Cheyenne River, South Dakota 12 TABLE II 1 CRITICAL STREAM REACHES IN THE UPPER MISSOURI RIVER BASIN Reach Boundaries Ins tream Resources Portions of mainstem, Houser Dam to Sheep Creek Premium trout fishery. Marony Dam to North Dakota state line (excluding Fort Peck Reservoid Premium trout and nontrout sport fisheries j rare pallid sturgeon and paddle fish habitats. Fort Benton to Fred Robinson Bridge 049 mile reach) Study river: federal Wild and Scenic River System. State Road 24 (east of Glasgow) to mouth Large, rare and unique paddle fish habitat. All or portions of several headwater tributaries Premium trout fisheries andl or rare Arctic grayling fish habitat. All or portions of several headwater tributaries; Skinner Lake to mouth All or portions of several headwater tributaries; West fork to Gallatin Gateway All or portions of several headwater tributaries; Yellowstone National Park boundary to mouth Confluence with North Tongue River to Dayton Premium trout fishery of national importance (brown, rainbow). Scenic valuej potential high recreation use. Cartersville Diversion to North Dakota state line Rare pallid sturgeon and paddle fish habitat; non- trout sport. fishery. Crandall Creek Bridge to Clarks Fort Canyon Study river: federal wild and Scenic River System. Headwaters to confluence of Blue Creek Wi ld brown trout fishery j rec. value: site of Hole in the Wall (Butch Cassidy hideout). East fork to Bull Lake; several mainstem tributaries Premium trout fishery. Yellowstone National Park boundary to Columbus; all or portions of several Upper Yellowstone tributaries Premium trout fishery andlor threatened species habitat (Yellowstone cutthroat trout> . Dickinson to Missouri River Excellent forage production; good furbearer population; heavy recreation use below Dickinson and Heart Butte reservoirs. Manning to Missouri River Premium sport fishery (channel catfish, walleye, sougar, northern pike, and white bass); river and floodplain highly valued aesthetically. South Dakota state line to Lake Sakakawea Critical spawning area for channel catfish of Lake Sakakawe<l; rare and pos- sibly threatened species habitat (flathead fish). Marmath to Lake Sakakawea State Wild and Scenic River; study river: federal Wild and Scenic River System. Garrison Dam to Lake Oahe Premium sport fisherYj rare fish spawning area (blue sucker, pallid and shovel- nose sturgeon, garn)j high historic, archaelogic, recreation, wildlife and aesthetic value. Lake 110 to Knife River Primary aaset--continuous waterflow as a result of springs; this spring flow is vital to overwintering of sport and forage fishes in Spring Creek and portions of the Knife River. Headwaters to Spearfish Premium trout fishery. Matt to Lake Oake Excellent furbearer popula- tion, forage production. Headwaters to Rapid City Premium trout fishery.