Merritt Nature Trail, Waterville
This trail has a lot of promise, but when I visited (winter of 2018) it needed a little attention. Some of the bridges and stairs needed repairs. The trail is not well marked — look for paths that leave the school campus and head off into the wood. There are faded blazes on trees. The trail wends along through the woods, with pretty views of Messalonskee Stream.
You can cross the stream and connect to the Thomas College trail, but I didn’t attempt this!
KM Trails is a great source for walkers.
Directions: From downtown Waterville, take Route 104 south. It becomes the West River Road where it crosses Messalonskee Stream at a double set of lights. Travel south until you see the Junior High School entrance and sign. Enter the school and proceed to the right beyond the school buildings.