Dusty is near Quincy. “Above” the lake are a bunch of decent car-camping fishing lakes: Quincy, Burke, Stan Coffin, and more. There’s a short access trail from up there down to Dusty.
The hiker way to get there is from the Ancient Lakes trailhead. I went in that way, camped at Dusty overnight, and hiked back the next day. Ancient Lakes is a worthwhile stop on the hike. Great camping. Unless there are a lot of folks coming down from above (none during my trip) this offers a backcountry-like experience during the springtime when the High Lakes are frozen.
Go! You won’t regret it!
-Curt