That's my home mooring and there's no anchorage there...just curious. Do you grab an empty mooring or pay the exorbitant Wentworth by the Sea dock fee's?
To note, you can anchor over at Pepperrell Cove just off Fort McCleary in Kittery. The anchorage is reasonably well protected, out of the currents, and the holding is good. A dingy ride up a protected channel takes you to some nice restaurants and Portsmouth proper if interested.