In the Des Moines metro, there is a brand new chain link fence that runs along the south side of Beaver Creek between the Des Moines River and the Merle Hay exit. And I believe that I saw a similarly placed fence south of the metro near Raccoon River and I-35. Other than attempting to keep flood debris off the interstate I have no idea why it was installed. I am guessing others know the real answer, so my question, why the fence?