I also read that book, steered to it by catbirdseat. I love the old fire lookouts. Haven't been on 3 Fingers, hope to someday, but I did reach the Desolation lookout where Kerouac spent the summer and later wrote about it in Dharma Bums.
we have determined that it's a mediterranean tortoise, approx. 10 years old (they live up to 70!) and prob abandoned by our former neighbors and their 5 kids.
when I slogged up Hood in late May (starting from the parking lot) I bumped into a friend of mine just below the hogs back who had taken the cat up to the top of plamer...to save time I guess. Still ended up summitting ahead of him as he had to double back and fetch his crampon.
I think you are correct good sir. The info is also on the BR web site. You gonna climb it?
"Call the park at (509) 427-8265 for more information" No exact date was given...only "mid-July".