RedactedNarrative: V#1 was idling beneath a highway overpass in an idle speed zone, when the operator reported seeing V#2 on full plane, entering into the idle speed zone and heading towards him. Prior to collision, operator of V#1 reduced his speed even slower pulling over to the right side of the river, so as to allow V#2 a wide area to pass by. Operator of V#1 attempted to get the attention of the other vessel operator by waiving his arms in the air, however V#2 continued towards him at the same speed. Vessel operator #2 was on full plane when it struck into a tree stump along the west shore line, deflected, and crossed directly into the path of V#1. V#2 subsequently glanced into the bow of V#1, with its starboard side, causing V#1 to rotate 180 degrees in a clockwise rotation and came to rest facing the direction the vessel came from (facing highway over pass).V#2 came to rest, perpendicular on the east side of V#1  with its outboard up against the center port side of V#1. No one was ejected or injured. Driver of V#2 was arrested for suspicion of BUI and transported to the county jail. Both vessels were able to be driven away from the scene.