Mount Baldy has been a bucket list spot for me as well, ever since I saw photos of it as a kid. I've never been there but have looked into it a bit, and apparently it's kinda tough to get to. There's a gap that you have to jump across if there's not a wooden plank in place to cross it, you have to make sure to go when there's no water flowing through, and supposedly the floor of the pipe is very rough, to the point that you will probably have to use real soft filmer type wheels to roll through it. Feel free to correct me on any of this, and good luck getting there.