Appalachian Trail: 100-Mile Wilderness

Appalachian Trail, Monson to Abol Bridge

The 100-Mile Wilderness is the last long stretch of the Appalachian Trail before Katahdin, running about 100 miles from Route 15 north of Monson to Abol Bridge on the Golden Road, just outside Baxter State Park. Backpacking Routes measures it at 99.4 miles and estimates five to ten days.

It isn’t true wilderness: Wikipedia notes it crosses several logging roads through lands managed by paper companies, with growing conservation work. But towns, stores, and paved roads are absent, and Backpacker’s summary is blunt: “For the most part, you’re on your own.”

The hike

Northbound from Monson, the trail starts with streams and ponds and soon reaches its first serious fords. SectionHiker’s 2009 report found Little Wilson Stream knee-high, and Paria Outdoor Products says Big Wilson Stream must be waded. Backpacking Routes lists Long Pond Stream and Big and Little Wilson Streams as crossings that can be difficult.

The Barren-Chairback Range follows, with the Barren Mountain ledges and a run of rough summits. SectionHiker spent his first nights at Long Pond Stream Lean-to and Chairback Gap Lean-to. Beyond the range comes the West Branch of the Pleasant River, which he found waist-deep, the longest ford of his trip.

Just past the river, a side trail leads to Gulf Hagas, a slate canyon where, as Paria puts it, “multiple cascades tumble down the narrow gorge.” The Appalachian Trail Conservancy notes that camping near the Gulf Hagas Cut-off trail is limited to designated sites. SectionHiker camped at the Sydney Tappan Campsite after the gorge.

The trail then climbs to White Cap Mountain, at 3,654 feet the high point of the Wilderness, according to Wikipedia. SectionHiker describes distant Katahdin views from its summit, and Paria says it offers “great views of where you’ve been and where you’re going.” Lean-tos on this stretch include Carl A. Newhall before the climb and East Branch beyond it.

North of White Cap the terrain flattens into lake country. Wikipedia lists Cooper Brook Falls Lean-to here, and the trail passes Lower Jo-Mary Lake, at 493 feet the lowest point of the Wilderness. The Antlers Campsite sits on that lake; both SectionHiker and Paria’s itinerary stopped there. Next come Potaywadjo Spring Lean-to, Nahmakanta Lake, and the Rainbow Stream Lean-to, then Rainbow Lake and Rainbow Ledges. Paria singles out the climb up Potaywadjo Ridge: “Steep climb in a short distance. But, the views are fantastic and yummy blueberries are abundant!” The trail ends at Abol Bridge on the Golden Road.

SectionHiker’s trip ended early with a knee injury he blamed partly on “heavy, wet leather boots,” and he recommends trail runners for terrain this wet.

To continue north, Backpacking Routes notes that Baxter State Park has its own permit rules for hiking on to Katahdin; see the Chimney Pond page for park camping basics. The Nahmakanta page covers a loop that shares part of this route.

Tips

Carry plenty of food or plan a drop. Backpacking Routes recommends a resupply for anyone taking more than five days; hostels in Monson and Millinocket offer food drops and shuttles.
Expect wet feet. Plan for several fords, and wait out high water.
Pick your season. Backpacking Routes calls summer “hot, humid, and buggy,” and recommends mid-June to early July or September into early October; Paria suggests late June to July.
Treat water. Streams and ponds are frequent, but filter or purify all of it.
Use designated sites near Nahmakanta Lake, Gulf Hagas, and road crossings.

Camping

No permit is needed for the 100-Mile Wilderness itself, according to Backpacking Routes and Paria. ATC’s camping rules for Maine allow campfires only at designated sites, prohibit camping above treeline, and limit camping to designated sites in some areas, including road crossings and the Gulf Hagas Cut-off area. Backpacking Routes says the lean-tos shown on Maine Appalachian Trail Club maps have privies but no bear boxes, so plan to hang food, and it suggests tenting at designated sites because of mice in the shelters.

Inside Intel: Backpacker’s Jo-Mary Road to Katahdin guide points to Potaywadjo Spring Lean-to, which sleeps eight, for its water: a “15-foot diameter bubbling sand spring.” Paria’s itinerary adds that the nearby Potaywadjo Ridge climb pays off with views and blueberries.

Trail facts

Distance: About 99.4 to 100 miles, depending on the source
Route type: Point to point (Monson to Abol Bridge)
Difficulty: Strenuous; plan 6 to 10 days
Elevation: High point White Cap Mountain, 3,654 ft; low point Lower Jo-Mary Lake, 493 ft (Wikipedia)
Campsites: Lean-tos and campsites including Long Pond Stream, Chairback Gap, Carl A. Newhall, East Branch, Cooper Brook Falls, Antlers, Potaywadjo Spring, Nahmakanta Lake, and Rainbow Stream
Water: Frequent streams and ponds; treat all water
Permits: None for the Wilderness; Baxter State Park rules apply to the north
Food storage: No bear boxes at shelters (Backpacking Routes)
Trailheads: Route 15 north of Monson; Abol Bridge on the Golden Road
Last verified: October 7, 2026

The Lowdown

Waist-deep fords in the 100-Mile Wilderness:

SectionHiker found the West Branch of the Pleasant River waist-deep, and Big Wilson Stream must be waded. Five ways to make these Maine fords safer, from timing to unbuckling your pack.

Get the five tips →

Where this comes from

This page draws on the sources below, along with other guides and trip reports. Links go to the original pages.

Before you go: This page is based on published trail guides, trip reports, and reviews, along with official park and agency information where we could find it. It’s meant to help backpackers discover new trails, not to replace current, official information. Conditions, closures, permits, campsites, and water sources change, and some details here may be out of date or wrong. Confirm everything with the managing agency and check current conditions before you head out, and don’t rely on this page alone for safety or navigation. Backcountry travel involves risk.