The Indian School Ditch is a water-channeling ditch in Albuquerque, NM. I've heard about it a few years ago and have been wanting to skate it since. RDY_2_Carve from the BOL forums lives in ABQ and offered to show me around. The ditch is 6-7 feet high, very smooth concrete, rounded transitions from wall to bottom. We rode a 1.5 mile section of it numerous times -- what a blast!
I have never skated anything non-flat -- so the ditch took some getting used to. My trucks were setup for pumping and were super loose, which made me wobble. But after a few rides I started to feel it... what a great ditch!

A view of the ditch