I work in the Glenwood Canyon, still haven't been up to the lake. The trail was closed this summer for a lot of renovation of the trail and boardwalk at the lake, they were using a helicopter to ferry materials up, so did not want hikers on the trail. I recommend not going on a major holiday, Labor Day, etc as the rest area parking is limited and can get exceptionally busy. If there is not parking you will be turned away by the park service. Do not park on the off ramp or block the bridge by the dam or you WILL be towed. Just trying to save you a headache.