Just spending the night at this BLM campground a few miles off I-15 , 30 some miles north of Helena, MT. We were fortunate to get a site on Friday afternoon, and it filled up shortly after we got here. It’s right on Holter Lake, and there are 2 other BLM campgrounds 5 miles down the road, also full tonight. This is a big boating park, so most of the people here appear to be local. It’s only $10/night but no hookups. We’re enjoying the warm weather and beautiful scenery.