Thom02099 makes good points.
In all fairness I should have stated that I have not see Mary's Lake since the County took it over; my thoughts were based on private ownership. And I have heard nothing but favorable comments like his since County takeover. And he states it fair and gives very good info.
And, my comments were based on commercial campgrounds. The ones in Rocky are very nice but limited in facilities and hard to get. And I am not sure the extent of flood damage in that last major storm or the repair / reconstruction to address it.
Thanks for pointing this out.