Just returned yesterday from a week in BWCA, but we flew into Grand Marais (KCKC).
We just tied down on the ramp and told the folks the parking brake was not on so if it looked like hail, that it would be okay to move into a hangar. Turns out there were some T-storms coming and they did put us into the hangar (next to a beautiful Cessna 195 on floats). So if flying into Grand Marais rather than Ely is an option, I think you'll have hangar options.
-Jim
P.S. First time for us in BWCA...fishing was okay, the experience was great!
P.P.S. Make sure to have one of these
tick keys...couple dozen total among the four of us.