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    This site will be offline for maintenance Tuesday, June 18th, 2024 starting at 10:00 AM pacific. The outage is expected to last approximately 15 minutes.


    Welcome to the Northwest Fisheries Science Center's (NWFSC) Salmon Population Summary (SPS) database web site. This site was designed to provide access to demographic data compiled for ESA-listed salmonid populations as part of the NWFSC's technical recovery planning efforts. The database contains data on spawning abundance, age structure of wild spawners, fraction of natural spawners that are of wild origin, and the reduction in spawning abundance due to harvest. For some populations, additional data fields are also available. The data correspond to the populations identified by the NMFS Technical Recovery Teams, and are used in part to assess population and ESU-level recovery criteria for many listed ESUs.


    The data in the SPS database are updated periodically. Updates can include both corrections to prior years’ data, as well as the addition of new data as it becomes available. Each update is stored as a separate archived database, available for selection using the menu box above. A brief description of the archive will appear once it is selected. More detailed information on data sources for each archive can be found in the references section of each archive.

    Disclaimer: Due to the wide variety of data sources that go into the SPS database, the NWFSC does not guarantee the accuracy of any of the data in the SPS database. In particular, neither the U.S. Government, nor any agency or employee thereof, makes any warranties, expressed or implied, with respect to the accuracy of the data, including but not limited to the implied warranties or merchantability and fitness for any particular purpose. In no event shall the U.S. Government, nor any agency or employee thereof, be liable for any direct, indirect, or consequential damage flowing from the use of the data in the SPS database.