After stopping to rest for a little while at Lower Mohawk Lake, we started around the south side of the lake towards the waterfalls on the far side, assuming that's where the trail was to Upper Mohawk Lake. We passed right by the actual trail however, and had to double back to find it. It actually heads south from the lower lake, before you've gone very far around the south side. It climbs fairly steeply in places, but it's a fairly quick hike, and there are wildflowers and great views everywhere, and you suddenly come upon the upper lake at eye level to the water! It's above tree line, bare rocky peaks on the opposite side, very different than the lower lake, but the contrast is great, and there are a lot less people up there! A footnote: Those waterfalls on the opposite side of Lower Mohawk Lake come down from a series of small lakes farther up a separate branch of the upper valley. Some friends who were with us hiked up that way, then crossed over a ridge to the south to come out on the north side of Upper Mohawk Lake. It sounded like a very strenuous route to take.