The difficulty in this multicache is in both the number and the variety of stages. Some of the stages are your basic find-the-next-coordinate. One stage includes following the directions, in the tradition of the letter-box. One stage is in the tradition of a mystery, where you read the sign and solve for the coordinates. And you might want to bring a compass and your distance pacing shoes.
The terrain would be fairly flat, except somebody put a levee up to keep the river back. Most of the routes can follow the trails, but a couple of places you have to go off trail. Expect tall weeds including nettles, but I did not see any poison ivy. When the river is high you might get your feet wet. When it's really high, you might not be able to finish this one without a canoe.
Placed with permission from Marshalltown Parks and Recreation department.