Thanks Oinone and Phil! Yes, the Ansel Adams shot is a classic photograph!
Ok, so the top is a 4800 ft (1600 m) climb from the valley floor. You start early. I started at 6:30, just as the sun was rising, but others on the trail had started at 3am. The first section is actually very scenic, passing two waterfalls on the Merced River. In May, when the snow is melting, they are spectacular, but by October they are all but dried up.
Then comes a long hard climb through a pine forest. It was here that I really started to notice the altitude. I had driven up from the Bay Area the day before, so I was not used to it. The thinner air really did slow me down a lot. Finally the forest thins out, and the trail zig-zags up the mountain. "It's wonderful," people coming down assured me. "Don't let the cables psyche you out when you first see them, they are great," said another.
I had heard of "the cables." How bad could they be?
Finally, after a very long, very hard hike, I saw them
"Oh my god, those are steep"!!!!!


This is hard to believe, but they are actually steeper than they look in the photographs. The slope is at least 45 degrees, probably 60.

Two steel cables, supported by metal poles, with a piece of wood every 10ft.