Diving in Glacier National Park July 2009

[DetectorGuy]

I am planning a 2 week camping trip starting in Glacier National Park in Montana and ending in Banff National Park, Alberta Canada in July 2009. I am planning on bringing 4 tanks and a dry suit. I think it will be cool (literally) to hit those mountain lakes and take photos of trout and see what the visibility is really like there. Lake McDonald and Flathead Lake look turquoise blue from the surface. I heard that this is from glacial silt that is suspended in the water. I doubt these lakes get dove very often. Has anyone here ever dove at 5000 feet above sea level? Where can I get an elevation dive table to back up the computers? Any advice about what I should be researching while I wait for July to get here would be appreciated.