This is a question for Cowlitz River regulars.

I noticed the water flow on the Cowlitz dropped from almost 14K cfs to less than 10K cfs between Friday and Saturday last weekend. It stayed at this level throughout the weekend then bounced back up by Monday. Is this standard operating procedure on the river? I swapped emails with a hydrologist at the USGS who mentioned some effort to manage river flows for increased recreational opportunities on weekends. Does anyone know anything about this or have additional information?