RedactedNarrative: On 07-04-2021, at approx. 1704 hours I responded to 963 Riverfront Dr. for a watercraft accident report.  The reporting party, O1, said the other party (later identified as O2) was driving a purple Ultra boat and had left the scene after hitting his jetski.  I was later advised that a second call was made to report the same accident by the other party and that his boat had sunk across from Rotary Park near the non-motorized boat ramp.
  
  O1 reported that he was near the cliffs in the area of the swirls on the Nevada side of the river and was doing large circles when the collision occurred.  O1 said O2 was travelling North and, as O1 was completing a turn, the rear end of his jetski struck the side of O2''s boat.  O1 said O2 attempted to swerve to the right just before the collision but it was too late.  O1 said O2 travelled a short distance to the north and stopped near the rock outcropping just before the swirls and began yelling at O1 that he had hit his boat and would have to pay for the damage.  O1 said O2 had hit him and it was his fault.  O1 said O2 then left down river towards Rotary park.  O1 called the police then returned to the residence he was staying at to wait for an officer to arrive.  O1 said he had video of the altercation just after the collision and he uploaded that through an evidence.com email invitation I sent him.  O1 also assisted as I drew a rough drawing of what had occurred just prior to and during the accident.
  
  Damage to O1''s jetski was to the right rear corner but O1 did not have an estimate of the cost of damage.
  
  I left to check the area for the boat and was advised of the other call reporting this accident and that the boat was across from Rotary Park sinking.  I located O2 and the boat just north of the non-motorized ramp at Rotary Park on the Nevada side of the river.  O2 also had a passenger, on his boat with him during the crash who was now on the shoreline with him.  
  
  I contacted witness who advised they were travelling up the river near the middle and he saw O1 doing circles on their left.  witness said O1 was coming towards their path and he began yelling for O1 to stop but he must not have heard them because he kept going and ran into the back of their boat.  Witness said O2 and he stopped the boat just north of the crash location but it was taking on water so they started heading south to try to get to Lazy Harry''s (where their trailer was) before it sunk.  Witness said O2 was talking to his dad on the phone and didn''t turn into the marina at Lazy Harry''s and then they couldn''t get the boat started again.  Witness said they floated until they were able to get it to the side of the river where they were now.  
  
  I then contacted O2 who said he was travelling up river near the middle, due to the shallow area on the Arizona side.  O2 said he knows he has to stay in a certain channel due to the water being deep enough for his boat and he can''t leave that area or he will damage it.  O2 said O1 was on his left side and turned directly into his path so he tried to go to his right but O1 stuck the back left side of his boat.  O2 said he did not try to flee but called his dad because he didn''t know what to do because his boat was sinking.  O2 said the engine had too much water in it and he wasn''t able to start it again.  O2 said they continued to float down river while sinking even as he tried bailing water out of the boat.  O2 said his dad called the police to report the accident since he was on the sinking boat.  
  
  I wasn''t able to see the hole in the rear left side of O2 boat because it was submerged under the water when I arrived.  O2 wasn''t able to provide an estimate of the damage on scene but la…