Late summer structure fishing for smallmouth bass on Lake Oahe, located on the Missouri River in South Dakota near Mobridge. Aggressively jigging Northland Fishing Tackle Ripping Minnows with guide Kerry Konold. Tips for using forward facing sonar to find bass. Details on locations and patterns for summer smallmouth on Lake Oahe. While walleye get much of the attention on Lake Oahe, this massive reservoir is quietly one of the Midwest’s best smallmouth bass fisheries with very little fishing pressure devoted specifically to bass. An underutilized fishing opportunity that is starting to turn heads in the angling community.