Split Rock Lighthouse Split Rock Lighthouse lit at sunset, 2010 Location Split Rock Lighthouse State Park, Beaver Bay Township, Lake County, Minnesota Coordinates 47°12′00″N 91°22′01″W﻿ / ﻿47.20005°N 91.3669°W﻿ / 47.20005; -91.3669Coordinates: 47°12′00″N 91°22′01″W﻿ / ﻿47.20005°N 91.3669°W﻿ / 47.20005; -91.3669 Year first lit 1910 Deactivated 1969 Foundation stone Tower shape Octagonal Height 54-foot (16 m) tower on a 130-foot (40 m) cliff Original lens 3rd order, bi-valve type Fresnel lens Range 22 nautical miles (41 km; 25 mi) Characteristic 0.5-second flash every 9.5 seconds ARLHS number USA-783.[1] Split Rock Lighthouse U.S. National Register of Historic Places U.S. National Historic Landmark Nearest city Two Harbors, Minnesota NRHP reference # 69000073 Significant dates Added to NRHP June 23, 1969[2] Designated NHL June 23, 2011 Heritage National Historic Landmark, place listed on the National Register of Historic Places [edit on Wikidata]