Marine Exchange of the San Francisco Bay Region

Physical Oceanographic Real-Time System



Developed by a partnership between the Marine Exchange of the San Francisco Bay Region, the National Ocean Service and the Office of Spill Prevention and Response, P.O.R.T.S. is a 24 hour-a-day program which measures the currents, depth, salinity and wind in San Francisco and Suisun Bays. Measurements are taken every six (6) minutes, available by telephone or computer website. This data is particularly important to the safety of merchant shipping, recreational boaters, ferry boats, wind surfers and the whole range of users of the bays. More details can be found in the PORTS White Paper (pdf).

The Marine Exchange maintains the sytem’s measurement and reporting network. The P.O.R.T.S. Maintenance Status page shows the status of the system and the progress of improvements.

Bay shipping faces danger. Lack of funding threatens high-tech system used to safely guide vessels.

Data is accessible via phone line or at the P.O.R.T.S. website. Access is FREE to anyone who needs this information.

Phone: (866) 727-6787
PORTS Brochure (Lite) .PDF
SF Bay Region P.O.R.T.S. Website
PORTS Brochure (Full) ,PDF
Tides & Currents National Website


P.O.R.T.S. Maintenance Status

Marcus Freeling of the Marine Exchange repairs and maintains the P.O.R.T.S. instruments and communications network in the Bay Area.

If you have any questions or comments, you can e-mail Marcus at