I was at the Upper Emerald Pools this morning 5/19/2018 and bumped into a group that had just finished the last rap. Since I'm doing heaps on Monday I was glad to get some intel on the canyon. They said it was full and very cold. One of their group had a 3mm and got pretty bad. Said they ended up spending the night when they were planning on doing the day trip. The guy I talked to said nothing less than 5mm to be safe. They may get on and post a more detailed report but wanted to put out the most current conditions.