Extensive field surveys began in 1993 to identify, map, and document use of feeding and roosting areas for shorebirds. Areas are labeled as feeding sites, roosting sites or both. Polygon boundaries have been modified by the Maine DEP to align with the state 1:24,000 coastline. Polygons have been modified by Maine Department of Inland Fisheries & Wildlife to include 100 ft and 250 ft disturbance protection zones around feeding and roosting sites, respectively, and to better align habitat boundaries with natural features based on high resolution, low tide imagery from Maine DMR. Areas of extensive development were clipped from the 250 ft. disturbance protection zones around roosting areas.