Sounds like someone did some unauthorized bucket stocking in your pond! Rainbow trout generally don't just fall out of the sky into ponds and it certainly didn't swim there from some unknown native Indiana population... HAHA
Probably happened around the date on this photo Scott sent me in a PM.
One of the fish he picked up from Crystal Springs in Muskegon, MI. Really Nice!
(Scott, hope you don't mind me posting the photo)