'Glacial Lake Mineral'?

[gary]

This may be outside this forum’s area of interest, but I was wondering if the local glacial geology literature mentions what I’m calling ‘Glacial Lake Mineral’?  When I pushed the 7.5 quads together centered on Mineral and Alder Lake, it appeared the Nisqually River might have been damned by the Puget Lobe (when > 1800’ high) and diverted down today’s Tilton River to Morton and the Cowlitz.  If so, a lake of at least ten square miles with a half-dozen fairly large, steep islands may have filled and drained a number of times.  There’s also a very odd-looking ‘capture’ canyon connecting Alder Lake to the upper Little Deschutes River that may have been the initial drain as the ice dam relented.