The State of Washington Water Research Center is leading work on the 2021 Columbia River Basin Long Term Water Supply and Demand Forecast, in close collaboration with the Washington Department of Ecology, Office of Columbia River, and many other partners. Every five years the Washington State Department of Ecology’s Office of Columbia River (OCR) updates information on what the water supply and demands will be in the Columbia River Basin over the next 20 years.  Workshops on the 2021 Draft Columbia River Basin Long-Term Water Supply & Demand Forecast were presented by WSU researchers, and feedback sought during a comment period held from June 2 to July 2, 2021. The 2021 Columbia River Basin Long-Term Water Supply & Demand Forecast is currently available as a draft, with a final version due later this year.


The forecast assesses how environmental and economic changes, and human responses impact water resources (supply), and in turn seeks to predict future water demands in light of these changes. Legislators, water managers, and the Office of Columbia River use the forecast to direct policy decisions for drought resiliency, and to meet water needs in the years to come. The forecast is one tool used to decide where to invest in water supply projects that have the greatest chance to meet demands and improve flows for fish under future conditions, as well as a range of other planning and water management actions.

The press release from Ecology for the 2021 Forecast is available here.

The 2016 Forecast is available here.


Jenny Adam,  Michael Barber, Michael Brady, Sonia Hall, Dan Haller, Sasha McLarty, Julie Padowski, Kirti Rajagopalan, Claudio Stockle, Jonathan Yoder, Georgine Yorgey, Matt Yourek, Fabio Scarpare, Min Liu, Aaron Whittemore, Hannah Goodspeed, Becca Gustine, Collins Asante-Sasu, Seann McClure, Jon Turk, Rojina Desar, Ry Weber, Ashish Kondal, Blair Deaver, Melissa Downes, Scott Tarbutton, Michael Callahan, Peter Price, Tyler Roberts, Jennifer Stephens, Wendy Valdez.