We stopped here for lunch to check it out as a potential spot for the future. So we didn't actually camp here but we looked around, took pictures, and made a plan for our return. First thing is that since this place is free and beautiful it fills up quickly. We arrived around 11:30 am and there were spots available but they were all taken by the time we left after our lunch. However, there is another free boondocking spot across the highway near the refuge entrance, so if you arrive too late to get a spot you could camp at the boondocking spot for one night and then try to get a campsite at the refuge the next day. It was October when we were there and the weather was cool and the leaves turning. Just gorgeous scenery and the campsites are literally right next to the lake. Lots and lots of water fowl. There are nice trails around the area too but be careful at the lower parts of the refuge because hunting is allowed there. The refuge consists of two lakes and a marsh. Parts of the lakes are muddy, which is probably how the place gets it's name. There are sites big enough for RVs and sites where only tents are allowed. None have hookups but they do have picnic tables. The road noise might bother some people. And the entire park is dirt roads, not paved. Parts of the road are narrow, so caution must be taken when passing other vehicles.