We've stopped here in the past but this was the first time we've seen the area so green!  It is a great pit stop or last minute spot right along the interstate going towards Dillon, MT.  There are plenty of spaces to pull up your RV or to toss a tent into the big open grass yard.  The north side isnt very shaded but close to the amenities and the south side has plenty of cottonwood trees to hang out under.  Nearby is a great river to fish in and the Native American site known as Rattlesnake Rock that looms over the river and park to the east.  There are some good albeit "spicy" sport and trad routes on the rock but as the name implies keep an eye out for snakes!  Nearby is the large Clark Canyon Reservoir where you can cool off and do some exhilarating cliff diving as long as the reservoir pool is high.