The original challenge, issued 1:17 PM EST, stated waterfall or water fountain. A revision to the original challenge was made over an hour later at 2:26 PM EST. By this time, riders had left to accomplish the issued challenge.
I'm ruling the revision to the challenge null - original challenge stands: waterfall, or water fountain.
Redsmartie was the first to post a picture fitting criteria of the first challenge, thus he wins this round and may assign the next challenge.
Current challenge: unassigned
Redsmartie has until 4:58 PM EST to assign a new challenge, else it falls back to the previous winner.