Holland & Knight - Status of US ports. Very good overview being regularly updated.
This site includes information on the status of US ports, including:
The US Coast Guard has implemented a new policy to centralize the notification of ship arrivals in US ports. As part of this new policy, the USCG announced the creation of the National Vessel Movement Center (NVMC). The NVMC began operations on October 15, 2001.
The information provided in this bulletin is believed to be correct, but we do not guarantee its completeness or accuracy.