Overview: The Carthew-Alderson Trail in Waterton Lakes National Park is a dramatic point-to-point hike that delivers sweeping alpine scenery, ridge walks, and stunning lake views. It links Cameron Lake with the Waterton townsite, climbing to high ridgelines above tree line before descending through subalpine forest. Known for its varied terrain, dramatic summits, and mix of exposed ridge, scree, and lakeside scenery, this hike is a favorite among experienced hikers looking for a full-day or multi-leg adventure.

Trail Details:
Trail Length: Approximately 11.6 miles (one-way)
Duration: About 6-7 hours (depending on stops and shuttle arrangements)
Difficulty Level: Hard
Elevation Gain: Around 2,778 ft 
Trail Type: Point-to-Point

Key Features:

• Forested Start & Switchbacks: The hike begins through dense montane forest near Cameron Lake, rising via several switchbacks early on.

• Ridge & Summit Exposure: Above the treeline, the trail traverses ridges, open terrains, scree slopes, and a summit area with panoramic views of Waterton’s peaks, the nearby Montana landscape, and alpine valleys.

• Alpine Lakes: Along the route are Carthew Lakes (upper, middle, lower) and Alderson Lake, each set against dramatic headwalls of mountains. These lakes provide striking reflections and excellent rest or photo-points.

• Scree / Loose Rock Sections: Some stretches (especially the ridge and summit approach) involve loose shale or scree, which can be steep and exposed. Hiking poles are useful.

• Varied Terrain & Ecological Zones: Hikers move through montane forest, subalpine meadows, alpine ridge zones, and shaded valleys. Weather exposure tends to increase higher up.

• Wildlife & Flora: Opportunities to see alpine wildflowers in season, sightings of mammals (marmots etc.), and frequent wind and sun exposure above tree line.

  
  

Trailhead Information:
Starting Point: Typically begins at the Cameron Lake trailhead; some start from the townsite and use shuttle to Cameron Lakes to make the hike point-to-point.
Ending Point: The Waterton townsite (via Cameron Falls / descending through forest) if doing the whole traverse.
Parking & Shuttle: Use of a shuttle from Waterton townsite to Cameron Lake is common and recommended; parking at trailheads can fill and shuttle seats may sell out.
Access Fees: Park entry fees for Waterton Lakes National Park apply. Bear spray is advised; wildlife is common.

Best Season to Visit:

Summer (mid-July through September): Best trail conditions; snow has melted on ridges; lakes accessible.
Late Summer / Early Fall: Cooler air, fewer bugs, but weather can shift quickly above tree line; ridges can be windy.
Spring / Early Summer: Snow may linger on ridges, scree sections may be wet or unstable; early season hike requires checking conditions.

Trail Tips:

Carry enough water and protection from sun—many exposed sections with little shade.
Use hiking poles for stability, especially on scree slopes and ridge parts.
Layer clothing; weather on ridges can be windy or cold even if lower elevations are warm.
Bring bug spray; flies and mosquitos are active in lower and forest sections.
Plan transportation (shuttle or car arrangements) since it’s point-to-point.
Bear safety: carry bear spray, make noise, stay on trail.

Trail Highlights:

Panoramic summit views from Carthew Summit and ridges, including vistas into Montana and across alpine bowls.
Glacially carved lakes and bowls: Carthew Lakes, Alderson Lake, framed by dramatic peaks.
Descent through lush forest and stream-side valleys back into Waterton, offering contrast to the exposed alpine climb.
Diverse scenery: forest, meadows, scree, lakes, ridges—all in one hike.

Additional Information:

The Carthew-Alderson Trail offers a taste of the “classic Rockies” hike: long distance, significant elevation change, spectacular views. Because of its one-way nature, logistics are important; arranging the shuttle ahead of time helps avoid delays. Weather can change rapidly above tree line; aim for steady, clear weather. Even though the trail is hard, it is extremely rewarding for those prepared.

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