The Rock of Ages Light is a U.S. Coast Guard lighthouse on a small rock outcropping (50 by 200 feet (15 m × 61 m)) approximately 2.25 miles (3.62 km) west of Washington Island and 3.5 miles (5.6 km) west of Isle Royale, in Eagle Harbor Township, Keweenaw County, Michigan (see map below). It is an active aid to navigation.