These data along with continuous monitoring at several locations (data provided through NWIS) are used to monitor bottom salinity and tidal currents associated with a project to better monitor X2 (position of 2 PSU [Practical Salinity Units] isohaline) in the lower Sacramento River and Suisun Bay, CA. Links to NWIS sites are provided in the associated web links under 'Related External Resources'. Data included in this data release are 15-minute water column velocity data at discrete bins and 3 locations along the lower Sacramento and Suisun Bay, CA. There are additional figures (.png files) and animations (.avi files) included in this data release, in order to familiarize the user with the content of the data. A publication will be associated with this data release in the future.