Lake Sakakawea is a large reservoir in the north central United States, impounded in 1953 by Garrison Dam, a U.S. Army Corps of Engineers dam located in the Missouri River basin in central North Dakota.
Named for the Shoshone-Hidatsa woman Sakakawea (who accompanied the Lewis and Clark Expedition), it is the largest man-made lake located entirely within North Dakota, the second largest in the United States by area after Lake Oahe, and the third largest in the United States by volume, after Lake Mead and Lake Powell.
The lake is located about fifty miles (80 km) from the state capital of Bismarck; the distance by the Missouri River is about 75 miles (120 km). The lakes width averages between 2–3 miles (3–5 km), with a maximum of 14 miles (23 km) at Van Hook Arm. Lake Sakakawea marks the maximum southwest extent of glaciation during the ice age. The lake is located within the counties of: Dunn, McKenzie, McLean, Mercer, Mountrail, and Williams.
