A boat slip barrier system is disclosed comprising a pivoting barrier arm assembly, a first post assembly with a first vertical post pivotally connected to the barrier arm, and a second post assembly with a second vertical post configured to temporarily hold a distal end of the barrier arm. The barrier arm can pivot between a closed configuration and an opened configuration, controlled by a remote control. The barrier arm assembly may include telescoping sections actuated for extension and retraction. The post assemblies may incorporate housings, actuators, microcontrollers, cameras, lights, and reflectors for enhanced visibility and remote operation. The system aims to provide a secure and controlled access barrier for a boat slip.