how deep is the water?
All I can say is that it was cold. My friend Jamal may know how deep it was.
In my youth I often swam that far out next to the pier, which was just beyond the outer surfline. (The “outer waves” are no longer there, since a storm in the late 80s flattened out the sand bar in the area.)
Given the gradual sandy slope, I would estimate the water depth to be around 20 feet, depending on the tide.