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
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