A dangerous reef stretches 1 mile (1.6 km) along the north and west shores of Caribou Island, and a shallow reef 2.5 miles (4.0 km) stretches beyond to the southwest to Caribou Island, lying only 11 feet (3.4 m) below the lake's surface.

When originally built, it was visible for 16 miles (26 km) and operated on a 30-second revolving cycle.

[4] Caribou Island is about 55 km (34 mi) off Agawa Bay on the east shore of the lake.

The present light was built in 1912 (station established 1886), flashes white every 15 seconds and is 31.5 meters (103 feet) tall.

The structure is painted white, while the lantern, gallery and watch room are red.