Well, the water level drops... Since you mentioned the pond is only a known max depth of 12', a drop of just a couple feet could open up a substantially larger area of pond bottom to sago pondweed growth that otherwise would have been too deep for the plant to grow in...
Hey! That was my theory (even if you expressed it better and more succinctly than I did!)! And since you're one of the guys whose posts I always read since you're pretty doggone smart on pond issues, I am suddenly feeling good about my answer!
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