RedactedNarrative: Operator stated they were anchored from the bow and stern out from Dam#2 and the hydro-electric plant on the AR River. When they got ready to leave, the rear anchor became entangled in the prop and as the operator attempted to untangle it, the boat tilted and began to take on water. When this happened passenger 2 cut the bow rope (anchor) causing V1's bow to drift down current.  Water came into the rear of V1 and capsized sending all occupants into the water. They were able to hold onto V1 and drifted downriver about 1/4 mile until they were picked up by another boat.