A light was established on the northern end of St. Modeste Island sometime before 1920 to guide mariners into The Tickle, as Michael MacDonald was serving as caretaker of the light in 1919. The present wooden, pyramidal tower was built in 1956 and has an exterior wooden catwalk that encircles its square, red-roofed lantern. The tower stands 5.5 metres tall and was electrified in 1956. In 2007 the lighthouse produced a red flash every three seconds, while its fog signal, installed in 1986, gave a blast every twenty seconds. St. Modeste Island Lighthouse was discontinued in 2010.
St. Modeste Island and the lighthouse are also known as MacDonald Island and lighthouse, after the MacDonald family that claims ownership of the island. The family has expressed an interest in acquiring the lighthouse.
There was an East St. Modeste that was located on the opposite side of Pinware Bay, but this settlement was abandoned in the mid-1950s.
Keepers: Michael Fowler, Michael Pike, P. Fowler (1949 – 1963).