Lewis and Clark Lake is a 31,000-acre Missouri River reservoir on the South Dakota-Nebraska border — the southernmost of the four Missouri River mainstem reservoirs in South Dakota and one of the most productive walleye and smallmouth bass fisheries on the upper Missouri River system. Gavins Point Dam at Yankton, South Dakota impounds the Missouri River to create the lake, which stretches approximately 25 miles upstream along the South Dakota-Nebraska border with 90 miles of shoreline across Clay and Yankton counties in South Dakota and Cedar and Knox counties in Nebraska. The Yankton corridor on the South Dakota side is the primary boating hub — Yankton’s position as the oldest city in South Dakota and a historic Missouri River crossing gives it a deep connection to the river boating culture that predates the reservoir’s creation in 1956. The walleye fishery on Lewis and Clark Lake is among the strongest on the entire Missouri River system — the tailwater fishery below Gavins Point Dam is particularly productive and draws dedicated walleye anglers from across South Dakota, Nebraska, and Iowa. Smallmouth bass, northern pike, channel catfish, and white bass round out the year-round fishery. Find Boat Services lists verified boat repair, motor service, electronics installation, trailer repair, and winterization providers serving Lewis and Clark Lake within 50 miles across the South Dakota and Nebraska Missouri River corridor.