Water Supply Outlook Report
The Water Supply Outlook Report (WSOR) contains water supply forecasts, which are statistical predictions of streamflow volume that will flow past a point on a stream during a specified period of time, typically in spring and summer. These forecasts are given not as a single number, but as a range of numbers to reflect forecast probability and uncertainty. Learn more about these forecasts and how to interpret them.
Latest WSOR Available: 1 April 2024
Reports are available for the first of each month from January to June.
Click Here to Access Historical WSORs
This directory provides access to all historical reports from 1990 to present. To view a historical report, simply select the "Water Supply Outlook Reports" drop-down menu, then select the water year of interest.
Receive the WSOR and other related Snow Survey updates by subscribing to our e-mail list here.
Additional Resources
Interactive Map
Map view of streamflow forecast and reservoir storage on the interactive map.
External Resources
Northwest River Forecast Center Oregon Department of Water Resources California Nevada River Forecast Center
- 10-Day Streamflow Forecasts - Bi-weekly Water Conditions Report - Ensemble Forecasts
- 120-Day Streamflow Forecasts
Contact Oregon Snow Survey
Do you have questions regarding water supply or snow survey data? Please click the above header to send us an e-mail.