This is a county park that is was well wooded and quite busy on a June Friday night.  Lots of local folks.  Stayed at the front-end of the part where apparently the sites are a little closer together than the rear sites.  Was passing through on a cross country trip so only stayed on one night.  Site with full hook-ups was only $30.  Partial or no hook-up even less.  You can reserve a spot by going online, though they do keep some as FCFS.

A few negatives about the park is that, with the local flavor, there were a lot of extended families there, and they all seemed to bring there dogs.  Lots of barking going on.  Our space was out of level but manageable, and the bath house and outhouse were on the rustic side.  Decent enough place when passing through, and a great price!

Have stayed here on multiple occasions going to and from Montana.  This campground is very well maintained with great amenities.  All sites have concrete pads with hookups.  Campground is very clean and has quick and easy access to the highway.  Has a bath house and laundry facilities on both sides of the campground, which can be a bit of a walk if you are on the outside.  Highly recommended if passing through the area.