I have been here a few times during travels through the area. We typically stop here to swim, paddle board and relax after cruising the North Cascades and the PCOR and to rinse/cool off after a few days of dispersed camping locally. This a nice lake to swim, paddle board, kayak, canoe and fish at. It has a decent day use parking area, boat launch and clean bathrooms if just passing through. An upper and lower campgrounds with plenty of spacious spots if staying longer. It can fit full size vehicles with campers or smaller trailers, overland vehicles with roof top tents, ground tents, hammocks etc.  Some spots can even fit multiple vehicles for RTT owners. It gets pretty packed during weekends but clears out by mid Sunday afternoon and would be a great pass through spot during mid week or early Thursday evening to snag a spot. Big loops for walking dogs on leash, small trail around lake and a dock for jumping in for a swim. Boat launch is for small boats maybe no more than 10-14 ft, canoes or kayaks. No motors. Will definitely be coming back to stay next summer for longer. 

https://www.fs.usda.gov/recarea/okawen/recarea/?recid=59107