I just did some searching on the Internet, about this 'long ago lake'.
Here in the Yukon, i always find there is still lots too be studied.
And when i find something on the Internet, Yukon publication are not always so accessible; "Grant Lowey" (he is a friend) " i couldn't add your article to my favorites for some reason." "So you know." Another article took me forever to down load.
Having overcome all obstacles! What i know now is sooo interesting.(to me)
Some point in time when Lake Champagne was a lake;
The highest water level was 772 meters. And indeed that is exactly the height of 'Don's descent' ( our back yard sledding hill).
Following that mark of 772 meters (on Google Earth), it does follow my beach trail.
Of course it is the other way around, my trail follows the high water mark.
For reasons, you can read on the Internet, the water level drops to 744 meters.
On google earth again, i see that that is exactly where there is a ridge. I have spoken about this ridge many times, it is where i overlook the highway and the Mendenhall River. At the South-West end of the fire smart.
Going down again, both the water level in the past and me now walking.
The water level drops to 714 meter.
Which is the height of the bluff on the South side of the Highway.