Lake Oahe is a 370,000-acre Missouri River reservoir stretching from Oahe Dam at Pierre, South Dakota north through the Standing Rock Sioux Reservation into south-central North Dakota — the largest reservoir in South Dakota by surface area and one of the most celebrated walleye fisheries in North America. The Mobridge corridor on the Standing Rock Sioux Reservation side of the lake sits near the geographic center of Oahe’s most productive walleye water — the expansive Missouri River impoundment produces walleye fishing that draws dedicated anglers from across the northern United States and Canada who specifically target the Mobridge reach for its trophy walleye potential. The lake stretches approximately 231 miles from Oahe Dam to the Bismarck North Dakota area, creating a massive reservoir across the rolling prairie of central South Dakota and south-central North Dakota with 2,250 miles of shoreline. Northern pike, smallmouth bass, chinook salmon, and channel catfish round out the year-round fishery. Find Boat Services lists verified boat repair, motor service, electronics installation, trailer repair, and winterization providers serving Lake Oahe within 35 miles of the Mobridge corridor across Walworth and Corson counties.