Youghiogheny

9.58 miles for the upper yough. First three miles are flat, losing a total of 15 feet, 5 fpm.

Gap Falls is about mile 2.6 on the maps.

Mile 3-4 = 33 feet.
4-5 = 126 feet
5-6 = 83
6-7 = 170 (mile 7 ends at Kendall on the maps, Topozone give this mile 130)
7-8 = 40
8-9 = 40
As we all know, that last mile is flat.