Merwin Arch is a nice arch located on public land near Kanab, Utah. It does require a bit of hiking and likely access to a 4×4 to reach it. It is worth the trip since Merwin Arch marks the entrance of Merwin slot canyon, a nice non-technical slot canyon that you will likely have to yourself if you visit. If you have a bit more time, I also recommend making the trip to see Bay Bill slot canyon, which is an additional mile each way from the confluence of Bay Bill Canyon and Merwin Canyon.
Merwin Arch dimensions are a little tricky, but it is about 40 feet wide and about 25 feet high. Pictures are tricky as you are right under the arch – the ones I have here were taken with a cheap fish-eye lens.
We saw Merwin Arch, Merwin slot canyon, Bay Bill slot canyon and Peek-a-boo slot canyon all on a great single day guided trip called Slot Canyon Photog Bonanza Tour with Dreamland Safari Tours. They are based in Kanab and will take care of all the details for you and provide a guide, vehicle and picnic lunch.
To get to Merwin arch, begin at the Mount Carmel Junction (with hwy 9) on hwy 89. Go south less than 1 mile and you’ll find a dirt road. Drive on it about one mile to a fence with a cattle guard. Park there and walk down Parunuweap Canyon for 5 miles on a public road that crosses private land to the confluence with Bay Bill Canyon. If you have a 4×4 you can drive this 5 mile stretch but you’ll be crossing the river bottom several times (the water is usually only ankle deep). From here, hike up the sandy wash of Bay Bill canyon. The hike is level but the sandy bottom will make it a bit more tiring. After about one mile, Merwin Canyon will open up on the left and you’ll need to walk .6 miles in a sandy wash to get to the entrance to Merwin slot canyon. Step inside the opening and you’ll be directly under Merwin Arch.
If you continue about 1 mile up Bay Bill canyon, you’ll get to the entrance to Bay Bill slot canyon, so doing both in the same hike is recommended.