Leprechaun Canyon has a big obstacle.
We went through Leprechaun west fork this weekend, 6-11-2011, and found that in the narrows after the west fork joins the main fork of leprechaun, there was a large boulder fall that has thrown several very large boulders into one of the corners that are a little more open in that section.
This is in the darkest section of the canyon, and required some serious moves to get through. The size requirements for navigation of the boulder fall at the bottom of the slot is significantly smaller than anything regularly found in Leprechaun.
We were able to slip through worm style, and then continue out the end, but I felt that anyone larger than myself would have a pretty tough time getting through, if at all.
My measurements are 41" chest, 32" waist, 20 inches across, from shoulder to shoulder.
Other than that, Leprechaun is beautiful, so if you can fit, enjoy the new obstacle to maneuver.