Accessing it from the Smarts Brook Trail side, the Yellow Jacket trail diverges to the left about 15 minutes after the Smarts Brook swimming hole, 55 minutes from the parking lot. After crossing a bridge over Smarts Brook, take a left and continue downstream, with the brook on your left. The trail descends gradually with some loose footing. Toward the end of the trail, it moves away from the brook; and soon the Pine Flats Trail diverges left. Shortly after that the trail ends, connecting to the Old Waterville Road.
Yellow Jacket Trail [WMNF]