Interagency Ecological Program (IEP)


Our research vessel, Sentinel, sails on the San Joaquin River near the Antioch bridge. DWR/2016

The Interagency Ecological Program (IEP) is a consortium of State and federal agencies that has been conducting cooperative ecological investigations since the 1970s. They provide and integrate relevant and timely ecological information for management of the Bay-Delta ecosystem and the water that flows through it. IEP believes the highest quality science contributes to achieving a reliable and sustainable water supply and a healthy Bay-Delta ecosystem.


IEP relies upon multidisciplinary teams of agency, academic, nongovernmental organizations, and other scientists to conduct collaborative and scientifically sound monitoring, research, modeling, and synthesis efforts for various aspects of the aquatic ecosystem. IEP also holds an annual workshop, publishes a quarterly newsletter and science highlights, and conducts technical and programmatic reviews of the program and its elements.


For more information, please visit the new Interagency Ecological Program website at:


Select the button below for IEP contact details.

Contact IEP

Technical Documents