US geological survey topo maps will let you get an approximate grade for large hills. I've cross checked them on hills I know have a posted grade, and it's usually pretty close (+/- 1% or better). The only depressing part about checking them was discovering that my nemesis hill is a piddling 5% grade on the steepest incline. *shakes her fist at Wisconsin for being so flat*



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Seriously, there was a horse parade, but, ok, I really wasn't going any farther. 25% is really steep--I'm impressed you can get up that hill.
