This photo shows part of the 1909 World's Fair held in Seattle, the Alaska Yukon Pacific Exposition. It was taken before the fair opened and probably was licensed from Frank Nowell, the official photographer of the exposition.
Note the way that "basin" is spelled. Otto was writing captions backwards on the glass negatives and sometimes misspelled words.
There is also an Image 1 (1 - A Cedar Tree in Washington - Circumference 67 Feet) and an Image R1 (R1 - On Mt. Rainier Washington). Reuse of image numbers and different image series make it difficult to know how many images Otto published.
This image is courtesy of Dan Kerlee.