The construction of Grand Coulee Dam resulted in the site being flooded in 1940, as was Kettle Falls. When Lake Roosevelt was drawn down for construction of Grand Coulee Dam's Powerhouse #3 in the late 1960s and early 1970, Fort Colvile and Kettle Falls were revealed. After archaeological work was performed by Washington State University and the University of Idaho, the Fort Colvile site was again inundated by Lake Roosevelt. In 1974, Fort Colvile was added to the National Register of Historic Places for its historic significance.