Just got update. The plane did not crash at Mirror Lake. It crashed on Crosswind lake which is a small lake on a bench right next to Morraine Creek. It is a very small lake that always seems to have across wind component.
BUT most importantly the Beaver did not have his flaps down. I have seen the pictures. Beavers cannot take off on floats with any kind of load without flaps. Can't do it. Big case of pilot error. Big! Reportedly, and from a very reliable source,  pilot had problems in past that led to him getting his present flying job. Glad no one killed. And not the first to crash at Crosswind Lake. And will not be the last IMO