RedactedNarrative: On 7/23/2016 @ approximately 0014 hours, Officer #1 was contacted regarding a boat incident where the vessel was lodged on a wing dam above San Souci Island on the Cedar River.  Operators from v1, V2 & a passenger were all rescued by the fire department as soon as the call came in, yet the vessels remained on scene till the morning hours. V1 was anchored on the river when V2 came along side and tied up to V1. Passenger from V2 jumped onto V1 and continued to drink & socialize with everyone  All occupants were drinking & didn't notice that the anchor from V1 had pulled loose & they were now drifting downstream toward the wing dam. Operator  from V2 jumped into V1 right before it hit the wing dam and got lodged in a large tree snag.  River stage was at the "action level" of 8.87 feet @ 2300 hours.  At 0600 hours the subjects were identified & interviewed by Officer #1.  All 3 subjects presented signs of being under the influence of an alcoholic beverage.  The odor of an alcoholic beverage was present on their persons and breath, blood shot watery eyes, muttered speech & the inability to recall events in a chronological order. V1 was removed from the river by the Waterloo Fire Department but V2 was sunk and unable to be removed due to the water level.  None of the individuals were wearing life jackets & were extremely intoxicated.  V1 has never sent in an Operators report.