Colorado River Basin Climate and Hydrology: State of the Science


Start Date

Research Theme
Primary Investigators
Other Investigators
Lineke Woelders
Benét Duncan
Joseph Barsugli
Imtiaz Rangwala
Rebecca Smith
Jeff Deems
Flavio Lehner
Klaus Wolter
Carly Jerla
James Prairie
Stephanie McAfee
Andy Wood
Connie Woodhouse
Ben Harding
Ethan Gutmann
Arizona Dept. of Water Resources
California's Six Agency Committee
Central Arizona Water Conservation District
Metropolitan Water District of Southern California
New Mexico Interstate Stream Commission
Southern Nevada Water Authority
Utah Division of Water Resources
Wyoming State Engineer's Office

Geographic Region

See: for more information about the report.


Navigating a river of knowledge 

In recent decades, increasing water demand, dry conditions, and warming temperatures have impacted the Colorado River, creating greater uncertainty about the future of the basin’s water supply. With support and guidance from over a dozen federal, state, and local water agencies, WWA researchers teamed up with leading experts to integrate nearly 800 peer-reviewed studies, agency reports, and other sources to assess the state of the science and technical practice relevant to water resources in the Colorado River Basin. 

Colorado River Basin Climate and Hydrology: State of the Science aims to create a shared understanding of the physical setting and the latest data, tools, and research underpinning the management of Colorado River water resources. In identifying both challenges and opportunities, the report will guide water resource managers and researchers in efforts to improve the short-term and mid-term forecasts and long-term projections for the basin's water system.


“Not only does this report analyze in extraordinary detail the latest data, discoveries, and decision support tools that are used in the basin, but it also lists a series of opportunities for using science and technology to help improve our understanding of current and future hydrologic conditions.” 
- Colby Pellegrino, Director of Water Resources, Southern Nevada Water Authority 

"This is by far the most comprehensive scientific report ever produced about the Southwest’s iconic river. Scientists summarize what they think about the past, present and future of the river and also provide challenges and opportunities for improving science to assist decision making in the 21st century."
- Brad Udall, Senior Water and Climate Research Scientist, Colorado Water Center, Colorado State University

"In connecting the dots between data, methods, models, and projections of future conditions, the State of the Science Report identifies both challenges and opportunities for strategic integration of new research and operational decision-making. It will provide an invaluable foundation for future research, planning and management in the Basin. The relationships between scientists, stakeholders, and Federal agencies that made this Report possible are critical to Reclamation’s ongoing commitment to using sound science in its management of the Colorado River." 
- Terry Fulp, Regional Director, Interior Region 8: Lower Colorado Basin, Bureau of Reclamation

Download the Report

Executive Summary

Full report (Recommended version; 80 mb PDF with high-resolution figures)

Full report (18 mb PDF with low-resolution figures)

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