This picture doesn't do it justice, but I'm running a 20K trail race this Sunday, which includes running up these stairs twice. It is about 200 steps and has some 90 degree turns that you don't see in the picture (but you can see how far below the river is where you start - the photo is at the top).
and here's another shot along the top of the river bluffs (not me in the picture, just some random runner from last year's race):