Not sure about the logging roads a few miles before the West Side road.  I'm guessing they eventually access the private timber land, but who knows.  Might be worth a look, call, or quite visit to the USFS website.  Volume at the put in was what you would expect - low in that it was quite high in the drainage, but fine in that the gradient was steep in that section.  Mainly glacial bouldery stuff in that first section before the upper gorge.