Red Lake and Red Lake River, Minn. Letter from the Secretary of War, transmitting, with a letter from the Chief of Engineers, reports on preliminary examination and survey of Red Lake, Minn., and Red Lake River from its outlet at Red Lake to its junction with the Red River of the north at Grand Forks, N. Dak., with a view to devising plans for regulating works whereby the level of said lake and the flow of said stream may be controlled in the interest of navigation, etc.