Vessel 1, with three persons on board, was launched into the river where the water was running high after some recent heavy rains.  Shortly after launching a wave came over the bow of Vessel 1, swamping Vessel 1.  Vessel 1 was then turned in the current, causing Vessel 1 to capsize and put all three Occupants into the water.  Two of the Occupants swam to shore with no difficulties; the third Occupant struck his leg on a rock during the incident and had to grab/hold on to a tree in the river where he was later rescued.
Fremont