That's interesting information Smalma. Do you have the sample years for that data handy? Certainly more comprehensive than anything I've seen and lends a little support to what Russ Orell reported for Skagit Chinook long ago.

C'man, PS fall Chinook arrive at seasonal low flow due to the long term selection of first arrivals as hatchery brood stock at Green River. Historical catch data indicate peak tribal catches of fall Chinook coinciding with fall rain and the rise in stream flows. Kalama fall Chinook are from local and lower Columbia River Tule Chinook which are later timed than Upriver Bright Fall Chinook, but earlier than historical LCR Tules, most likely because of the same tendency of hatcheries to select first arrivals as brood stock. As Smalma pointed out with respect to Snoqualmie fall Chinook, wild Skagit falls, what few still exist, have a much later run timing than the ubiquitous Green River hatchery stock. I recall seeing a very few caught in early December when the Tribes were targeting Chambers Ck hatchery winter steelhead.