NOAA: Most California Rivers Will Peak in the Next 1-4 Weeks | Expected Dates of Peak Spring Flows: SnowBrains | April 21, 2016 | Industry News Share this article image: noaa, today “Expected date of peak spring flow/inflow. Most locations are expected to peak in the next 1-4 weeks.” You might also like: Posted by SnowBrains | April 21, 2016