We chose the Emery Bay Campground primarily because the were no open spots in the Glacier National Park campgrounds for a rig our size. Emery Bay Campground is about 15 minutes from the west entrance to Glacier National Park and is located in the Flathead National Forest .
It does not have very many sites that would accommodate our rig. hehe… we got the last one. It is located on the Hungry Horse Reservoir and even has a boat ramp. It, however, does not have very good access to the water to swim or play. There is a few places not too far away to get in the water. It worked out great for us as a single place to stay that had water access and Glacier National Park close enough to get to easily.
Emery Bay Campground
http://www.fs.usda.gov/recarea/flathead/recreation/hiking/recarea/?recid=66358&actid=33
Martin City, MT 59926
GPS coordinates: 48.333910, -113.949823