I took the bus that leaves from the top parking lot of the ski resort. The ride is 5 mins. The bus route is only open in the summer and early fall. It will save you a boring hike to the trailhead. Once you get off the bus, the trailhead is right there. It maybe 1.5 miles, but the altitude is high and at times the trail steep. Once you get to the lake, you will be glad you made the effort to do this trip. One cannot swim in the lake though as this is a watershed (as are all lakes in the Big/Little Cottonwoods).