We drove up here on July 3rd hoping to camp at Barnes Meadow Reservoir. You can't drive in to Barnes Meadow so we took County Road 103 north around Chambers lake and found a lot of open spots beneath lodgepole pines. Several spots have a large pull in parking area where you could have a large RV, truck and trailer, or park several cars. I couldn't help thinking this area is perfect for a large group to set up several tents and have several individual campsites with their own fire right next to each other.
There is no water, electrical or toilets, but there are toilets at the Lost Lake trailhead which is a 2-3 minute drive up the road or a 15 minute walk.
We did walk down to the lake right behind our campsite. The bank is steep but passable by kids so most people can get down there and back up. We fished a bit in Chambers and Lost Lake. On the other side of the lake is the improved Chambers Lake Campground but it's a 15 minute drive around to the other side of the lake. And a further drive up Rd 103 takes you to lots of stream fishing, hiking trails, and more dispersed camping.