18. At Half Moon Bay the low tide is at 2:30 in the morning and is -4.5 feet. The high tide is at 6:45 in the morning and is 7 feet. 2hr 7. Smin rICH . d. A boat needs at least 5 feet of water to dock. When can a boat dock? (give times over a 24 hour period) 5= 5.75 cos 415. (X-6.75), +1.25