In a conversation I had with Mary Stensvold (regional botanist with the US Forest Service in Sitka), she indicated that this particular pool is the only known location for this species for hundreds of miles. Sometime after that conversation, I read the book Sitka: Portal to Romance by Barrett Willoughby. It was published in 1930 and contains a substantial section describing time spent with E.W. Merrill (a relatively well known local photographer in the early 1900's). The following passage caught my attention:
He told us he had sent to the States the year before for some white water-lily bulbs. After their arrival he spent a month planting them in ponds at different levels above the sea in the hope that they would thrive and make more beautiful those isolated lakes which perhaps only his eyes have seen or will see for years to come. "I wish I might bring you some of the first blossoms," he said, looking at Kay, who was very lovely and golden in the sunlight. "But they have not yet bloomed. The native yellow water-lilies, on which the moose so loves to feed, are in full flower, but don't you agree with me that there is something -- well, intangibly beautiful in the thought of those delicate white lilies of the South floating up there on our Northern mountain lakes? It's like -- bringing a lovely woman home from a foreign land," he finished.This made me wonder if perhaps these flowers had originally been placed by Merrill. In some further investigation I found a Washington department of ecology informational page (the species is considered invasive in Washington) that indicates it is believed that the waterlily was introduced to Washington during the Alaska Pacific Yukon Exposition held in Seattle in the late 1800s.