Lake Tschida, also known as Heart Butte Reservoir, was created in 1949 with the completion of the damming of the Heart River about half way between Glen Ullin and Elgin in southwestern North Dakota (northwestern Grant County) and covers about 175,000 acres.

In addition to its primary function as a flood control vehicle, the lake provides numerous recreational opportunities including fishing, boating, camping, and swimming. Fish species include walleye, white bass, crappie and pike.