My wife hates the road. Especially going west to east. She was born and raised in Ohio. Driving on one and maybe a half lane mountain road with drop offs you stare at from the passenger seat makes her nervous as all get out. The funny thing is it actually is one of the better mountain roads out there.
I have a few pictures of the falls. I might have to dig them up.
Not sure I would of gone to Butte. There is a road past Wisdom that heads north toward Anaconda. Maybe stay at Fairmont Hot Springs. Or head up to Deer Lodge and visit the territorial prison there. Butte is as you describe it...and not sure what road you took going to Anaconda (my only guess is parallel 90). Anyway still a great trip.
Never seen or heard of the place. But you see places like that popping up all over Montana. A little bit out of the range of the average Joe, that's for sure.