Mill Brook Preserve features a 6-mile trail system first opened in 2016 on 130 acres of forested land along Mill Brook in Westbrook. Mill Brook is notable for the largest annual migration of alewife fish from Casco Bay to Highland Lake. The fish migration can be seen while hiking along the trail in late May and early June. This secluded and hilly forest valley is peaceful and feels remote while just minutes from Maine’s largest urban center. This Preserve is in the homeland of the Wabanaki People. We respectfully acknowledge these People of the Dawn–past, present and future–and their connection to these lands and waters. Please see below for the trail map and more information about the preserve and trails.         TRAIL FACTS Activities: hiking, running, snowshoeing, cross-country skiing,Viewing the largest alewife fish migration from Casco Bay. During the run please do not get into the water, and please keep dogs on leash and out of the water.Hunting is bow and arrow onlyLeave No Trace: Please take out whatever you bring inDifficulty: Moderate (South and North) to Difficult (Center and parts of the North)Length: 6 miles          Click for Directions to Trailhead