Little Diamond Island formerly known as Little Hog Island is part of the City of Portland and is the closest island community to Portland. At low tide it is connected by a sandbar to Great Diamond. The Northwest portion of the island was subdivided in the late 19th century and is now a summer community of about 55 cottages served by Casco Bay Lines. Most of the remainder of the island was owned until the early 21st century by the Sisters of Mercy order who operated a seasonal orphanage and retreat house there. A former Lighthouse service depot faces the Diamond Roads, the channel between Peaks and the Diamonds. Water is supplied by the Portland Water district, with many cottages served by seasonal above ground piping.