This is not a proper trail report, as what I did was drive up to the cell towers at the top of the butte, apparently where the hike proper is supposed to end. While the entry here on WTA now indicates that the entirety of Selah Butte is on private land and should not be visited, other sites online do not say that. Moreover, the 4WD access road (quite passable in my 4Runner) is neither signed nor gated, with free access above the public streets serving the houses on the east side of the canyon south of the (previously official?) trailhead at MM 4. I have no idea when WTA changed this entry, and did not check the status of the trailhead down on WA 821 (Canyon Road) at MM4. The views on top are superb when facing away from the infrastructure, with Pahto (Adams), Tahoma (Rainier) and Mount Stuart all shining in the sun. There are no obvious trails from the summit, but scrambling around could be a lot of fun.

Ascended the long route up Selah Butte. The trail branches off to the left about a half mile up the normal route to stay under the ridge line. This route starts off as an obvious trail, but quickly fades in and out, passing over basalt scree, and enters into class 2 scramble regularly. There are a couple large scree sections where there is no trail, and making the wrong route choice leads into a class 3 scramble. The hillside is open and exposed so it's never too time consuming to find the trail again.

I don't recommend this route to new or beginner hikers.

Good conditioning hike. Views are beautiful at the top. This hike is hard, no doubt. Coming down, I would recommended trekking poles as it is steep and easy to slip on rocks.

The parking lot is immediately after a sharp corner with no visibility, but there is a wide shoulder 50 yards past the parking lot that is a lot safer to pull out of.

Trail is in very good condition with mud in a few places and slippery due to dust in other steep parts. 

We arrived about 10:30AM on Sunday, and there were 3 vehicles in the lot.  One of them, an older sedan was blocking most of the remaining parking.   We squeezed in on the road spur the starts the trail and noticed that the sedan had an occupant.   He waited around for a few minutes, while we laced up for the trail, and then he left.  I moved my Prius to a regular spot. 

It was a really nice hike on a sunny day with my buddy Josh. We met one fellow near the trail head returning to his truck, and passed another couple on their way up. We had excellent views up and down the canyon almost the entire way.  The trail is steep in places that creates some difficulty on descent, but totally manageable with careful foot placement.   

All was great until we got back to the trail head.  There was only my Prius, but there was a big pile of glass where one of the cars had been.  And, of course, the driver window on my Prius had been smashed out.  There wasn't much of value in the two bags taken--microspikes, cell phone charger, toilet paper, hand sanitizer, sunscreen, ratty old sneakers, etc.  Josh and I speculate that the Sedan's occupant was about to hit the other two cars that were already there when we arrived.  The guy we met returning to the trail head probably got back to his vehicle and left before the other two cars were burgled.

I-90 is really loud with a missing driver's window. 

Nice hike, though!