Lake of the Falls

10 feet. Turtle River (Mercer-Turtle Flambeau Flowage Area). Travel north from Mercer on U.S. 51 for 1.4 miles. Turn left (west) on County FF and proceed 5.2 miles. Turn left at Iron County Park/Lake of the Falls sign. Here you’ll find Popko Circle picnic and rustic camping facilities & a boat landing with access to the Turtle-Flambeau Flowage via the Turtle River.