Great Divide Trail (Waterton Section)

This 34-mile, one-way section of the Great Divide Trail runs from Boundary Bay through Waterton townsite and the Carthew–Alderson high country, then crosses the park to Sage Pass. The mapped distance includes the short Akamina Parkway road connector between Cameron Lake and the Rowe Lakes trailhead. It stops at Sage Pass; the longer route beyond the park is a separate section. The park-only mileage is measured from the mapped route because published totals cover a larger section or only the Carthew–Alderson day hike.

Allow roughly three to four days as a planning estimate, with about 27 hours of hiking spread across steep climbs, rocky descents and a remote northern half. This is a hard backpacking traverse, not a long day hike. Reserve each backcountry campground you plan to use and obtain a Parks Canada backcountry permit before setting out. Waterton townsite is the main resupply and lodging stop; campsites along the route include Boundary Bay, Bertha Bay, Alderson Lake, Lone Lake and Twin Lakes.

The southern start is at the international-boundary monument at Boundary Bay. Most hikers walk about 6 km from Waterton townsite to reach it. From there, the trail follows spurs near Upper Waterton Lake into town, then climbs from Cameron Falls toward Alderson Lake beneath Mount Alderson’s cliffs. Above the lake, steep switchbacks cross shale, loose scree and shrub bands to Carthew Lakes and Carthew Summit. The high point is exposed, with broad views back to the lakes and across Waterton Valley toward the prairie. Descend by more switchbacks to Cameron Lake.

Cameron Lake has a small refreshments shop, canoe rentals and a vault toilet. After the short road walk on Akamina Parkway to the Rowe Lakes trailhead, the route climbs through forest to Rowe Meadows, a recommended place to collect water. It continues up Lineham Ridge, then crosses a chain of saddles through the burned Blakiston Valley, passing Lone and Twin Lakes before the final climb to Sage Pass. Carry water treatment and enough capacity for the distance between reliable sources.

The 2017 Kenow wildfire left long open stretches with little shade, especially around the Blakiston Valley; hot, sunny days can make the northern traverse feel harder. The Carthew and Lineham sections combine steep grades, loose rock and exposed ridge terrain. The route is on established trails, but it is a remote multi-day walk with no difficult river crossings under ordinary conditions. Use bear-safe food practices around Cameron Lake and Akamina Creek.

Sage Pass is a park exit, not a road-side pickup. Arrange transport from the north end using the Twin Lakes/Snowshoe Trail connection toward Red Rock Parkway, and check vehicle access before relying on that road. The separate walk from Waterton townsite south to the Boundary Bay monument is not included in the 34-mile mapped total. Dogs are allowed on park trails when leashed and under control; the same rule applies throughout this mapped section.