Nestled in a scenic river valley just 12 miles northwest of Valley City, North Dakota, Lake Ashtabula is a picturesque manmade impoundment on the Sheyenne River. The reservoir offers anglers ample opportunities to catch a variety of gamefish species.Walleyes, smallmouth bass and northern pike are the predominant predators,” says Northland Fishing Tackle’s Cody Roswick. Proprietor of Fin Hunter’s Guide Service, Roswick fishes Ashtabula year-round, and notes, “There are als…