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Figure 1: IEP logo

Interagency Ecological Program for the San Francisco Estuary

This report shows trends in water quality, plankton, and fish across multiple IEP surveys for March through May of 2018.

Regions of the Estuary

Delta Outflow

  • Freshwater flow influences water quality, plankton, and fish populations.
  • Spring flow is driven primarily by rainfall, snowmelt, and upstream dam releases.
  • The spring of 2018 had somewhat slightly lower outflow than average.

Disclaimer: While substantial efforts are made to ensure the accuracy of these data, complete accuracy of data sets cannot be guaranteed. This report was developed by the IEP Synthesis Team. For questions, comments, or corrections, contact Rosemary Hartman –