On the west side of Rocky Mountain National Park. Not far from my recent hike from Milner Pass towards Mount Ida, but about two thousand feet lower in elevation and a little further west. The trail starts at around 9300 feet MSL and climbs to the Lake at 11,040 feet. There isn't much that is really steep - but it just climbs all the way - for 5.1 miles.
On the way to the trailhead, I paused to take a shot of some nice clouds near Lake Irene.