A SCENIC TOUR
Not-Imlay is a surprise -- a pretty good canyon rather unlike other Zion canyons. The scenery is splendid as it drops steeply towards The Narrows, across from the Mountain of Mystery. Big raps are not unusual for Zion, but there is also a long-downclimbing slot that is fun and challenging, with the spiciest bits easily rappelled. It makes for a lovely day out in the spring or fall.
The name is kinda silly, and like many silly names, I personally take some credit for it. If one were to be so foolish as to undertake the right-hand Imlay Sneak Route without a map or description, one could end up here. It would be unfortunate, as one would have far too little rope to complete this canyon!
The canyon has been off-the-radar, so it shows little sign of passage. A plus to many of us, perhaps to you too. The wilder character is sweet, but with traffic, some of the rappel anchors will need to change to stouter objects, or our use will end up killing the small trees used at some locations. In other words, bring webbing and a refined sense of judgment. Be smart. Back things up. Caveat rappelor.
The other caveat is to be very careful on the last rappel, as it goes into The Narrows in a place where hikers are likely to be hiking by. Thankfully there is little to no loose rock at the end, but it will require conscientious ropework to not endanger those below. The first person will need to rappel with the ropebag rather than tossing it - at least until the landing spot can be seen. Feeding the rope down from the top does not work due to an intervening rope-catching ledge.
All in all, a great canyon, but not a place for beginners. Long rappels, judgment-requiring anchors, the possible people below on the last rap... Not a good place for beginners.