Southeast Iowa law officers have stumbled across a little hidden treasure at the bottom of a river.Several stolen vehicles were found in the Des Moines River over the past several days. The water level was lowered for work on the Ottumwa hydrodam gates. A station wagon, a truck, a minivan and a motorcycle were found in the muck. The Iowa County truck was stolen from Marengo, the minivan was take in Jefferson County several years ago, while the station wagon was stolen in connection with an Ottumwa burglary.