
— the green the cirque keeps.
“The fourth and final lake on the climb up from Bear Lake. Past Nymph, past Dream, then the trail breaks out under Hallett Peak and Flattop and the green is right there. A small remnant of Tyndall Glacier sits in the cirque above; what runs off it is what colours the water. Most days in summer the trail is crowded by mid-morning. The early walkers get the lake to themselves, with the cliffs returning sound across it.

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Three or five different vistas, hung together — a chapter of places you've been, or want to go.
Emerald Lake sits at roughly 10,110 feet on the east side of the Continental Divide, in the Bear Lake corridor of Rocky Mountain National Park. The trail begins at the Bear Lake Trailhead in Larimer County, Colorado, climbs about 605 feet over 1.8 miles, and passes Nymph and Dream Lakes before opening into the cirque held between Hallett Peak (12,713 ft) and Flattop Mountain (12,324 ft). Rocky Mountain National Park was established by Congress in 1915 and now protects 415 square miles of the Front Range. The trailhead requires a timed-entry reservation between late May and mid-October.
The green comes from glacial rock flour — extremely fine particles of granite and gneiss ground from the cirque walls by Tyndall Glacier, the small remnant ice field still held between Hallett Peak (12,713 ft) and Flattop Mountain. The particles stay suspended in the meltwater and scatter sunlight in the green-to-turquoise range. The same mechanism colours Moraine Lake in Banff and Lago di Sorapis in the Dolomites, though Emerald Lake is comparatively shallow and warms enough by late summer for the occasional swimmer. Water levels rise through June as snowmelt comes off Hallett and Flattop, then slowly fall through September; the colour reads strongest in the weeks just after the runoff peaks.
The trail leaves the Bear Lake parking area, reaches Nymph Lake at about half a mile, Dream Lake at roughly 1.1 miles, and tops out at Emerald Lake at 1.8 miles, for a 3.6-mile round trip. Total elevation gain runs near 605 feet, which puts the round-trip inside two hours for most walkers and longer for anyone stopping at each lake. Between late May and mid-October the Bear Lake corridor is gated by the park's timed-entry permit system; reservations open in advance through recreation.gov. The corridor shuttle from the Park and Ride at Glacier Basin is the way to skip the parking lot. In winter the route becomes a snowshoe trip and the lake freezes solid.