Avalanche River National Glacier Park
Glacial water contains tiny bits of rock and minerals called "rock flour" in
suspension from the grinding action of the glacier. Those rock particles refract
the green spectrum of the sun's light so it appears green.
Note: We were told that this beautiful river along with all the surrounding lakes,
will soon loose their pretty colors because of global warming. The rate the glaciers
are melting even the largest of the mountain glaciers will be gone. I think the
guide on our boat tour said within 20 years these colors will have vanished along
with the glaciers. :o(