Mary Ann Falls

Mary Ann Falls is a 13.9 km (8.6 mi) out-and-back through Acadian forest to a 6 m cascade and swimming hole on Mary Ann Brook. This is a half-day hike, not a quick waterfall stop: allow 5 to 6 hours for the walk and time at the falls. The route starts at the Warren Lake Road parking lot and follows a former road corridor; the old drive-in approach is closed to vehicles, so plan to hike the full distance.

You walk the same corridor out and back, with the waterfall as the main payoff rather than a chain of named viewpoints. The surface is uneven in places, and there are long, steep sections. The park rates the trail moderate, but the distance and sustained commitment make it a bigger outing than that label may suggest. The map shows a mostly direct forest route and no named stops along the way. The terrain profile climbs from the trailhead into the 160 m range before dropping toward the brook; the return repeats that rise. Save enough time and energy for the same corridor back.

Part of this route follows the original Cabot Trail alignment. That road was laid out in the 1920s and served as the main route through this part of the Highlands until the coastal alignment was completed in the 1950s. Storm washouts later ended vehicle access, and the corridor was turned into a hiking trail. That history explains why older descriptions talk about driving almost to the falls; they describe a different visit than the one available now.

At the end, a sturdy staircase descends the steep bank to the base of the 6 m waterfall. The pool below is a long-known swimming spot, but this is a remote place and emergency help is not close. Near the brook, remnants of an old iron bridge provide foot passage to the north side. The bridge area above and the base reached by the stairs give you two different views of the falls; take the stairs only if you are comfortable with the steep descent.

Park at the Warren Lake Road trailhead; the marked Warren Lake picnic area is near the start, but no current on-route food or service was established. This is a hiking-only route, not a roadside waterfall pull-off. If you are short on time or looking for an easy stop, pick a shorter walk elsewhere in the park; the approach is a large part of this outing. Plan around the full 5 to 6 hours and the remote setting rather than treating the waterfall as a brief detour.