RedactedNarrative: On June 1, 2018 Vessel 1 (V1) was operated by Operator 1 (O1) on Lake Oahe in Campbell County, SD with three passengers on board 
  (P1, P2, and P3).  O1 and P1,P2, and P3 had been fishing northwest of Pollock in the main channel portion of the Missouri River.   
  
  At approximately 9:20 AM, V1 was headed southeast back toward the West Pollock boat ramp in 2 to 3 foot waves.  When V1 got near Point LaGrace the waves increased in size dramatically to an estimated 6-10 foot waves at times.  O1 said that the waves were spaced closer together than O1 had ever seen before.  V1 was trying to take the waves at a slow pace and slowly work back toward the boat ramp, and water started coming over the bow and the stern at the same time.  All passengers on board the boat put their PFDs on when the waves began to turn rough. 
  
  O1 attempted to turn V1 around to get back to the area that was more wind protected with smaller waves to beach the boat.  When V1 started to turn the main outboard motor quit working.  O1 started the smaller kicker motor to try and correct the direction of the boat.  The kicker motor also quit working.  O1 tried to use a trolling motor to get the boat toward shore.  However, waves came over the side of the boat.  Once the boat had taken on some water another wave capsized the boat. 
  
  V1 eventually floated to the shoreline approximately 200 yards from where it capsized. 
  
  Additional note, V1 does not have registration numbers on it because it is a new boat with an estimated 20 hours on, and O1 had not been assigned numbers as of the time of the accident.