I was at that ride as well. I work in Albia, live in Moravia and looks like I ride quite a few of the same places you do.
I did the same as you, re-rode that route (using the roll chart paper) last week before it started raining.
I went the route you did on the ride.....when I cam back I went up the hill instead.
Then rode around some of the wider trails - looks like they were cleared with a bulldozer - went to a few farm fields close by.....
The B level roads in southern Iowa....some decent riding if you look.
Even some fair single track in Stephens State forest.....lots of logging roads and paths
I have as much fun as I can.....for a fat guy on a KLR.