The horizontal enlarger is still sitting in Carmel where it always has.
The current Ansel Adams Gallery was built in the late 20s in what is NOW the Yosemite Village (Visitor Center, Post Office, Village Store, NPS Admin offices, etc). It was not destroyed in the floods of 1996...the water really didn't make it's way up there.
Yes, the Yosemite darkroom is used for workshop demos (Alan Ross, John Sexton, Kerik Kouklis, etc..) and by a few TAAG employees.
formerly of The Ansel Adams Gallery (1993-2004)