I'm not trying to be a smart ass, but if you mean the inlet from the Gulf into St. Andrews bay, it's about 50', at least 40' anyway.
St. Andrews marina is different, and St. Andrews St. Park is shallower.
Lots of stuff called St. Andrews, I'd hate to tell you it's real deep, but be thinking about something different from what your thinking and run you aground.
Where are you at in Tarpon springs? I'd of course be willing to share a cold beer
with you and show you some charts
, maybe advise on anchorages