Early during the morning of July 7 the 207' cruise ship Spirit of Glacier Bay grounded on a soft, silty mud bottom at the northern end of Tarr Inlet with 3000 to 4000 gallons of #2 diesel during a falling tide. No discharge was reported when Sector Juneau was notified at 0744 on July 7. NOAA is currently providing tides and weather information to the Coast Guard along with a preliminary written trajectory. The vessel refloated on the afternoon rising tide. No compromise occurred to the hull or fuel tanks, although there was some minor internal structural damage. The vessel will be headed to dry dock for a complete examination and repair, as needed.