Data Courtesy of U.S. Army Corps of Engineers, NWD and Grant County PUD and Chelan County PUD and Douglas County PUD
Mainstem Columbia
Snake Basin
Upper Columbia
Query Notes and Methods
- Figures show for each location: (1) the top plot the daily average water temperature data at Columbia River and Snake River forebay water quality monitor (WQM) sites with inseason forecast temperatures, highest observed (historical period) and historical mean with +/- 1 standard deviation (SD); (2) the middle plot the historical run timing 10 year average for sockeye and steelhead adult passage; and (3) the bottom plot the current sockeye and steelhead adult passage counts. Observed data is updated daily; inseason forecasts are updated weekly.
- Visualizations inspired by the work presented at Fraser River environmental watch, Fisheries and Oceans Canada
- For additional information including individual year details for Water Temperature, please refer to the DART River Environment Graphics & Text query and DART River Environment Metadata & Glossary.
- Water Quality Forecasts based on Observed Water Quality Monitoring for Columbia and Snake River Dams and Temperature Forecasts Methods and Information
- For additional information including individual year details for sockeye and steelhead Adult Passage, please refer to the DART Adult Passage Counts Graphics & Text query and DART Adult Passage Visual Counts Metadata & Glossary.
- Historical Run Timing average for sockeye and steelhead adult passage for 10 Years generated by DART Adult Passage Counts Historical Run Timing
Water temperature data can be noisy and difficult to QA/QC. For Rock Island, years 2000 and 2007 are excluded from historical data. For Wells, year 2001 is excluded from historical data.


