I have fished the Umpqua about 15 miles below Roseburg for smallmouth. Frankly, trying to wade bedrock with humongous holes in it just doesn't appeal to me. I have never looked at it above Roseburg that I know of.
I don't recall seeing any spot I could wade across, and from the high water marks I figure access to the lower river from the bank is gonna be tough in the winter. I was thinking about taking my sled but not gonna have the time to use it much so no dice there.
I seem to remember a county park just downriver from Roseburg that had access between the rivers and also on the North bank at another park. I remember thinking there might be some access in that area for bank fishing. There was also a boat launch with some kind of dock there. Never went down to look close.
Grant