Nicely done! And I've wondered about the interflood years and how soon plant and animal life returned to the regions affected by the floods. If there were dozens of years between flood events, then the region must of had a fairly lush and varied biology.
And it's a pity that there few, if any, stories or evidence of the human migration that had to come through the region during the final few major floods. Seeing a Missoula megaflood event would of been terrifying to witness, even from a safe distance.