You're probably already there, and I don't boat that stretch much, but at the current 12.1 height (I always use the Estacada guage), you might be able to squeak up the first riffle without doing the gravel-churn.
Bear in mind, the tide on the Willy dictates the depth of that lower section.
And if you catch a nook, handle it with kid gloves while releasing it (pretty sure it's closed to nooks right now). Very few fall run nooks, and it would be nice if they came back in good numbers.
Generally (can vary wildly), once we get to this time of year, the only coho you'll catch (and there can be a ton of them) will be wild... but you never know. You can still catch summer steelies, but I doubt there's many that low in the river. Every once in a while, you can get a very early winter this time of year, but don't hold your breath.
For future reference, if the river level is up (say, over 12.5 or so), you can drop the boat in at Riverside, Carver, or even Barton and fish those immediate areas. All of them have places you can fish without running too far up or down... and starting upstream is a good idea -- going downstream and finding out you don't have the power to get back up kinda sucks (and it often takes more power and momentum than you'd think).