Photo © Steve
First of all, the aircraft is a Martin JRM-2 or JRM-3 Mars, and it appears to be in US Navy colors.
More Importantly, I question the location of Sproat Lake. Forest Industries Flying Tankers of Port Alberni bought four of the Mars aircraft in the mid 1950s. The Marshall Mars, however, was destroyed in a fire off the coast of Hawaii a few years earlier.
Also, Since I have been to Port Alberni and know how small of a town it is, I find it hard to believe that the US Navy would bring the Mars here along with so many personel, and have facilities built to accomodate such a monster aircraft. I would also expect to see a lot more mountains or trees in the background instead of buildings.
So if anyone knows more about the location of this photo, we can make sure the information is accurate in the database.