What is the tallest and most rugged mountains in the us?

Well, there are many very rugged mountain ranges in the U.S., and I have climbed in many ranges. Obviously the tallest mountains are in Alaska, with Denali/Mt. McKinley being the tallest. I personally think of rugged as steep.

Since there is no real "ruggedness" measurement, I will share my (unordered) list of very rugged mountain ranges/regions:

Teton Range in Wyoming

Absoroka Range in Montana/Wyoming

Lewis and Livingston Ranges in Montana (Glacier National Park)

Pickett Range (North Cascades National Park)

Southern Sierra Nevadas

In particular, Glacier and North Cascades National Parks have the steepest terrains I have seen anywhere. Check them out on googleEarth sometime!