It turns out that the 1 arc second SRTM topographic data for Wolf Creek is available. (SRTM is the Shuttle Radar Topographic Mission, which collected ground height data for most of the world during a mission from Feb 11-21, 2000). 1 arc sec works out to 101 feet North-South by 81 feet East-West.
This data lets us do fun things like this:
But a contour map is more useful:
Of course, the question everyone is really dying to argue about, is "how steep is it?"
So here we go. These are average sloples computed from the height data:
I fiddled the color map to put a sharp boundary at 35 degrees - anything red to orange to green is more than that:
Light blue to white to purple is going to be steep enough to have fun. Dark blue? Better keep your speed up!
Here are zooms on the waterfall area, Alberta Peak, and the Knife Ridge:
Can you poke holes in this data? Sure. It was C and X band, and I don't know if that penetrates snow. Apparently "thick vegetation" can cause returns from the canopy instead of the ground -- do big evergreen trees count? Don't know. Averages should still be not-too-far off, and Alberta Peak is above tree line.