Maximum discharge along the river was observed at the Cowlitz River At Castle Rock with a streamflow rate of 18,600 cfs. This is also the deepest point on the Cowlitz River, with a gauge stage of 37.86 ft. This river is monitored from 4 different streamgauging stations along the Cowlitz River, the highest being perched at an elevation of 1,053 ft, the Cowlitz River At Packwood .

Streamflow conditions and seasonal statistics

Streamgauges reporting the most discharge on the Cowlitz River

Discharge comparison for the highest gauges over the past 10 days

Streamflow discharge range for this time of year