I was on my way to WR7X's Point Prominence Lookout cache (never actually made it though) when I came across this viewpoint on my topo map. The Summit Spring fire lookout was built here sometime in the 1930s, but is long gone. When you get to the cache location you'll be able to see the foundation of the old lookout. The view from this spot looks west out over the valley and south. This spot is labeled "Vinny Viewpoint" on the topo map, although the source of that name is unknown. To get here, start at the trailhead coordinates near the campground and follow the trail up the hill. When you get to the coordinates listed below, turn left and follow the spur trail up. (This spur trail is hidden by a fallen tree but it is there!) You'll reach a big sloping meadow and if you go just a little further you'll reach Vinny Viewpoint and GZ. A big thanks to just peachy for this detailed description!
Yes, there's other ways to get to this one, but I'll let you figure that part out if you must. There's no getting around at least a short hike to this one, though. Additionally, expect snow on the ground until mid-July. I know what guidebooks say about the area... something like Late May - Late October. This year just isn't cooperating with those guidebooks! My lone encounter with civilization was a 20-person scout group hiking up from the snowline with plans on camping at the campground. It was 32 degrees and snowing hard when we parted ways. Should be interesting for them with 3-foot drifts even at the lower elevations.
I enclosed a book on Forest Lookouts in the Olympics and Northern Cascades. It's neat to read about these old buildings up high. Anyway, it served me well. I hope you'll get as much out of it as I did.