RedactedNarrative: On the approximate date and time stated above, vessel #1 flooded, swamped and partially sank in slip #34 at Grand Mariner Marina on Dog River.  The entire port side of vessel #1 was almost completely submerged.  Vessel #1 has approximately 135 gallons of gasoline on board and 12 or more quarts of oil in the engines and generator.  The gasoline and oil on board vessel #1 are creating the possibility for a hazmat spill to occur in Dog River.  It is recommended that vessel #1 be removed from the water before a hazmat spill occurs.  Photographs of vessel #1 were taken and will be available along with copies of this accident report.