The Shaw-Weil "Canoeing Guide to Western Pennsylvania" probably has a good deal of that info. It's almost impossible to find a print copy of this book now, since it's been over 20 years since the last printing. There was a pre-print version online for free, but it appears to be gone now.
I could check my copy and relay the info there to the group if I knew what rivers/creeks you're interested in.
I can tell you the minimum flow for Little Beaver Creek is about 400 cfs, and the minimum for Clarion River is also about 400 cfs (Cooksburg PA USGS gauge).
Steve Z
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