The "expert oarsman" section of the Sauk is the reach between the Whitechuck River and Darrington, with some technical boulder gardens. That section is not open to fishing during the winter season. The section from Darrington to Bennettville Bridge (Hwy 530) would be pretty easy but for the ever-changing channel braids and logjams and sweepers. And that, I think, is why it takes out a few boats from time to time, because it's pretty easy, except for when it isn't. The section from Bennettville bridge to the mouth has always been pretty easy in my experience and opinion. BTW, there is no take out near the mouth of the Sauk, so if you're there, you're committed to another 4 or 5 miles downstream to Faber's Ferry on the Skagit.