The principal storage facility for the Milk River Project was initially intended to be a dam on the St. Mary Lakes (Upper St. Mary Lake in Glacier National Park and Lower St. Mary Lake just east of the park), but no suitable damsite could be found. The Sherburne Lakes in Swiftcurrent Valley were selected as an alternate site, with work beginning in 1914. Building material was borrowed from the upper end of the Sherburne Lakes. In order to expedite transportation of materials, a small tug boat and several barges were purchased for $1900 and hauled overland from Seattle to the project site. Work continued through 1915 and 1916. Swiftcurrent Creek was diverted through the dam's outlet works in April 1916. Work was hampered by delays from spring flooding. The outlet tower and gatehouse were built in 1917, together with the spillway. In October observations indicated that the spillway was being displaced by a slide originating in a hill to the north of the spillway. Drainage of lakes above the slide did not cure the problem. Work on the dam and its control works continued through 1918, but the spillway problems continued. Water storage began in 1919. Eventually the spillway walls and floor were built of wood timbers to allow for movement. Work was complete in 1921. As originally built, Lake Sherburne impounded behind the dam.