NOAA's San Francisco Tide Gauge Station (IMAGE) University of Hawaii at Manoa Caption This is the current site of the San Francisco tide gauge operated by NOAA, which is one of the longest and highest-quality records of ocean water level in the world. The tide gauge was initially installed in 1854. Credit Image courtesy of NOAA Tides and Currents. Usage Restrictions Image may only be used with appropriate caption and credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.