Looks like NARA might have some of it...
41.3.1 Records of the First Supervising District (San Francisco,
CA)
Textual Records: Letters sent and received by local boards at Juneau and Sitka, AK, 1898-1910; and journal of George Whitney, local inspector for Alaska, May-October, 1898. Records of the local board at Seattle, WA, including case files of casualties and violations, 1887-1942; annual reports, 1907-23; inspections of hulls and boilers, 1898-1927; and selected docketed correspondence, 1908-33
(in Seattle).
Even if this goes nowhere, it is good experience for future projects, and I don't think I will be diving again this year after Friday, so got to do something over the long cold winter!
Besides, how many good, undiscovered wrecks are there in the sound? Gotta go after the ones you know about.