Warm and very dry conditions in June 2025 contributed to worsening drought conditions and declining streamflow statewide. June streamflow has dropped below normal as indicated on the monthly streamflow percentile map, courtesy of the USGS Water Watch. Almost all basins have below normal flow, and many across western Washington and the Cascades are now in the “much below normal” category. This means 10% or fewer years have seen lower streamflow during June in these basins.
