RedactedNarrative: Vessel 1 was cruising in a N/W direction attempting to navigate to Catfish Bay boat ramp when Vessel 1 ran aground and struck embankment on port side.  AOI is approx. .2 mile S. of the North Shore line and and approx. 100 yds W. of the east shore line.  after impact Vessel 1slid approx. 15 Ft on clay/rock shore to POR. North of AOI.   Vessel 1 operator states he his familiar with the area but due to darkness was not aware he was close to land.