RedactedNarrative: V1 was in the Des Moines River near the sand plant wash out when they decided to leave the area around 10:30 pm & go to the main channel.  V1 didn't realize how swift the current was & when he went into the main channel, he hit a submerged log & got stuck/slowed by the log.  The current took the stern of the boat twisted it around & immediately swamped the boat while flipping it over.  The boat lodged into the log pile.  The boat was recovered 2 days later.  Neither individuals were wearing life jackets.