We were visiting GNP in mid-June 2021 and originally wanted to stay at Apgar, or another campground closer to the Going to the Sun road, but since we did not have reservation to get into Glacier National Park & going to the Sun Road, we headed up to the north fork area of GNP to see if we could get a campsite at Bowman lake or Kintla Lake Campground.  When we arrived at the Polebridge Ranger Station the ranger thought we should be able to get a campsite at Bowman so we headed the 6+ miles down the  curvy dirt road to Bowman Lake. When we arrived around 2pm there were only 3  campsites occupied so we found a nice level campsite to pitch our tent.  The campsites were spread out enough that you had plenty of privacy (except for those dang deer and chipmunks that keep on visiting us). This campground only has pit toilets.  The views from the lake are unbelievable and we enjoyed our hike around the lake. We also drove the 15+ miles up to Kintla Lake (the campground was empty and had only a few campsites compared to Bowman Lake).  When we returned to GNP in September of 2021 we were able to get a campsite at Apgar but we took a day off from hiking and drove up to Bowman Lake, this lake is a hidden gem, so peaceful and so beautiful, definitely worth the long bumpy trip.  Bowman lake is definitely my favorite lake at GNP.