You got darn lucky...I wish I would have seen this earlier but the only time you HAVE to contact ACoE is if you are interfering with a riverbank or floodplain directly adjacent to or directly upstream of..a federal (Classified Navigable) stream/waterway.
ACoE could still potentially come back on that because there are several permit types issued..Been through this fight.
Again, I'd say you are lucky.. might want to go buy a lottery ticket also.

Last edited by Snipe; 10/25/20 11:49 PM.