Stegosaurus Butte is the informal name for the rocky ridge separating Rainy Creek and the Mid Fork Snoqualmie River, near the Gateway Trailhead. A fun little way trail climbs 1000 feet to the ridge, which offers some great views.
To get there, I cruised down the now well-graded and shiny Mid Fork road to the Gateway Trailhead. Before starting the hike, I checked out the fancy new campground nearby. There was nobody there except the campground host...I wonder how busy it gets on weekends?
After walking across the Gateway Bridge and admiring the impressive snowmelt-swollen river, I turned right and headed west on the rough trail along the riverbank. This is actually a section of the old and honorable Middle Fork Trail that once went all the way to North Bend. It should be restored again so that hikers can reach the Pratt River.
After walking 200 yards or so on this trail, I noticed that the slope to the left eased off, so I left the path and headed cross country up the forested hillside. A brief, easy scramble up a cliffy section brought me to a ridgetop that might be called Little Stegosaurus. The ridgeline remained level for quite a distance, then steepened again when it approached the main mass of the Butte. At this point, I encountered a flagged way trail. This steep route led me efficiently to the first summit of Stegosaurus, where ledges provided great views up Rainy Creek to Preacher Mountain and east toward the great granite wall of Mt Garfield.
The flagged route faded out here. Curious as to what lay ahead, I crashed through a brushy slope down to a saddle, and up to the second and third peaks of Stegosaurus, which offered pretty much more of the same--more mossy ledges with views. I was surprised to see some shore pines growing among the usual firs and hemlocks. There must be a harsh and dry micro-climate up on the Butte.
I was tempted to try to get down to the saddle between Stegosaurus and the main mass of Preacher Mountain, but being alone, mapless, and already pretty well scratched up, I decided not to chance it. I have been to that saddle before , which is easy to reach from Rainy Creek. It is possible to drop down from the saddle to the Mid Fork Trail without enduring too much suffering.