Islet Campground Professional Review and Guide
"Though not many people seem to know about it, Waldo Lake is Oregon’s second-biggest natural lake (after Crater Lake), with a surface area of 9.8 square miles. It is also Oregon’s second-deepest natural lake (again, after Crater Lake), averaging 128 feet with a maximum depth of 420 feet. It is reputed to be one of the purest lakes on Earth, some say nearly as pure as distilled water, because the only sources of water coming into the lake are precipitation and snowmelt. Partly because of the lake’s purity, when the weather is calm you can see 120 feet down into it. It is also ringed by old-growth forest and wilderness, with mountain views, trails all over the place, practically no motorboats allowed, and several great campsites.
The three campgrounds around the lake (Islet, North Waldo, and Shadow Bay) are pretty much the same, but Islet is the smallest one, so we’re recommending it. All three have the same facilities, basic layouts, and ideal locations right on the shore of the lake, so in the grand scheme of things, it doesn’t matter where you camp, just as long as you’re at Waldo Lake."