We hiked this trail with backpacks as a day hike and was impressed by inclines and declines of the trail to the lake. We did this on a three day weekend towards the end of the summer so the weather was perfect in Washington.
We would definately hike this trail again and stay the night. There is a trail head and a sign in station where you log in. There where people already camped out around the lake so be mindeful of their camps when you get to the lake. For more information check out the link below.