CBEP developed a database of sites around Casco Bay where restricted tidal flow threatens salt marsh habitat, with the goal of prioritizing sites for restoration.  After examining surveys and aerial photographs, CBEP conducted field evaluations with the help of Maine Department of Transportation, the Maine Geological Survey, and the GIS lab at the University of Southern Maine.  So far, the study has identified 133 known or suspected tidal restrictions throughout the watershed (see map, right).