Possibly the hardest mile in Connecticut. Other hills are steeper for the mile, but Dibble has one feature the others do not. It ends with an immense wall. The first couple times I did it, I got about 2/3s done and thought to myself "this isn't as bad as I remembered it" and then you see the wall and realize you're not done. You turn the corner and then you have a complete slog ahead of you to get up the final ~200 meters.
Dibble Hill Road is located in Connecticut. It is 1499.1 meters long with an average gradient of 10.1% and a maximum gradient of 19.9%. Find similar hills.