Haven't been down that stretch since we did Whitebridge (place that used to have a white bridge, but no bridge there now) to Black Creek this last winter. Can't remember any hazards then. Its usually a short and easy float. Low water, or maybe launching and pulling out, might be your biggest concerns. For summer steel there, you probably want to fish either very early, or very late in the day, if you can. First and last hour of light. In between, its a waste of time there any more.
You'd probably have better luck running into fish floating the Bogy from the fish hatchery down to its confluence with the Quill. There's supposed to be some searun cutts in there right now, as well as a lot more summer steel right now than the Wynoochee ever gets any more. Other than that, I don't know anything.
Disclaimer: I have developed a bad attitude toward the "Nooch" in recent years, though. I only fish it on rare occassions, any more.
Another idea, considering the flows are nicely down to where I like 'em, is the Cowlitz below Mayfield dam. The Blue Creek to Mission run is pretty easy, and reports are that there's some summer runs in the river.