RedactedNarrative: On August 22, 2020 at roughly 19.48 EST, KSP Post 4 called about a vessel that wrecked next to Rough River Lake in Breckenridge County Sheriff's Department. Dispatched advised there was one, possibly two, injured and EMS was enroute along with Breckinridge County Sheriff's Department. 
  
  I contacted Breckinridge County Dispatch to get further details, and to find out which deputy was on scene. Breckinridge County Sheriff's Office, stated that a female occupant was transported by EMS to Twin Lakes Hospital for a shoulder injury and the male driver, OPERATOR 1, was still at the scene and appeared to be intoxicated. 
  
  I arrived on scene at roughly 20:47 EST, and spoke with Breckinridge County Sheriff's Office, who already performed SFST's on OPERATOR 1, as well as administered two preliminary breath tests that showed a presence of alcohol. I then spoke with OPERATOR 1, as well as administered two preliminary breath tests that showed a presence of alcohol. I then spoke with OPERATOR 1, and asked how the accident occurred. 
  
  OPERATOR 1 stated that he was leaving a benefit on the lake and when coming out of a bend on the lake, he saw a white speedboat coming towards his direction of travel. OPERATOR 1 said that he veered right to avoid the speedboat and saw the dock. OPERATOR 1 decided to travel between the dock and the bank to avoid hitting the boats that were slipped in the dock. This is when OPERATOR 1's vessel hit the dock then came to rest on the rocks and walkway to the dock. OPERATOR 1's passenger was sitting next to OPERATOR 1 and when the accident occurred, it propelled her to the front of the vessel. 
  
  I could smell a presence of alcoholic beverage on OPERATOR 1's breath while he was telling the story, and OPERATOR 1 admitted to drinking roughly ten beers during the day. I performed Horizontal Gaze Nystagmus on OPERATOR 1 and observed six of six clues (although improperly documented on the citation), and then arrested OPERATOR 1 for probable cause boating under the influence 1st. I did not perform a full battery of SFSTs on OPERATOR 1 due to the two deputies performing various tests prior to my arrival and informing me of their observations on OPERATOR 1's intoxication. Deputies supplied a full statement of his observations. I departed the scene with OPERATOR 1 at roughly 21:33 EST and lodged OPERATOR 1 at the Breckinridge County Detention Center. 
  
  PASSENGER 1 sustained minor injuries to her left shoulder, and was released from Twin Lakes Hospital. On August 23, 2020, I went back to the scene to take pictures and obtain a statement from the witness at the above address. Witness stated that she heard and saw OPERATOR 1's vessel hit their dock then rest on the walkway and rocks of the dock. Witness stated that she could not see if there was a white speedboat heading down the lake prior to the incident, but stated that no other boats arrived after the incident. 
  
  In my opinion as a Conservation Officer of eight years, I believe that the cause of this incident was mainly due to alcohol intoxication followed by operator inattention.