Thunder Lake Trail is a hiking trail in Boulder County, Colorado. It is within Rocky Mountain National Park. It is 4.5 miles long and begins at 8,884 feet altitude. Traveling the entire trail is 9.0 miles with a total elevation gain of 2,284 feet. The Tent Rocks (elevation 9,012 feet) cliff and Aspen Knoll, Tahosa, and another camp site can be seen along the trail. The trail ends near the Pine Ridge camp site. There is also an information guidepost near the end of the trail.
Thunder Lake Trail Professional Reviews and Guides
"This hike runs through Wild Basin and veers northwest to the eastern slopes of the Continental Divide. Along the way, Mertensia Falls flows long and lovely, dropping hundreds of feet in a tumbling cascade from Eagle Lake and Box Lake, and into North Saint Vrain Creek. Higher up at 12,220-foot Pilot Mountain, “Falcon Falls” pours heartily from Falcon Lake in a long horsetail splash, while Fan Falls splatters and spills its way in a playful cascade. Both falls flow southeast to Thunder Lake and join the waters of Mertensia at North Saint Vrain Creek."
--Susan Joy Paul, Hiking Waterfalls in Colorado (Falcon Guides).
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