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Upper Arrowhead Loop is an expert black bump run that is straight up steep and nasty (but fun).
These are big Volkswagen-sized bumps, especially on the top half.
It will make your quads burn, but you know what they say, “No pain, no Jane!” This trail is usually less crowded than the other Jane trails, but seriously, Mary Jane is an uncrowded resort in comparison to others in the Northern Colorado Rockies.