The St. Paul District constructed and placed approximately 15 dams into operation starting with Lake Winnie, Leech Lake and Pokegama Lake dams on the Headwaters of the Mississippi River in 1884 and concluded with the Highway 75/Bigstone Dam in 1972. Except for the Headwaters dams that were constructed at the outlets of large natural lakes, the remaining dams created new reservoirs. These lakes, reservoirs and tail water areas created prime locations for outdoor recreation and visitors slowly starting utilizing the areas as railroads, road systems, vehicles and accessibility became more modern.