Lake Constance is one of the most rewarding suffer-fests in Olympic National Park—an absolutely relentless climb that earns every bit of its payoff. The hike starts out mellow along the Dosewallips River on a wide, smooth trail (honestly, biking this approach is a smart move if you want to save time), but once you hit the Lake Constance junction the vibe changes fast: the route turns steep, rugged, and at times barely-maintained, with loose dirt, roots, blowdowns, and sections that feel nearly vertical. The grind is real, but the reward at the top is unreal—clear turquoise water tucked beneath towering granite walls, with Avalanche Canyon rising behind the lake toward Mount Constance like something out of another world. If you’re doing this one, an overnight is the move so you can actually enjoy it (and you’ll need a backcountry permit for the Lake Constance campsites), plus you’ll have bear wires and even a composting toilet up there—which feels like luxury after that climb. It’s a brutal hike in the best way, and if you want a true “Olympics classic” that feels earned, Lake Constance delivers.