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2nd confirmed nesting location in Utah and 1st with physical evidence(photos and video).
We had arrived at the waterfall around 7:20pm 6/25/22, intending to spend the night. At 7:53pm, we spotted the 1st Black Swift flying over the canyon east of the falls. Over the next 40 minutes, we would periodically see 2 swifts flying around, often together chasing each other, mainly over the canyon. Then they started to come in closer, directly above the falls so we commenced climbing the falls to be able to see the upper section of the falls and watch where they landed, this required some rock climbing and was a bit precarious at times, but we did it without incident. As we arrive on the ledge overlooking the top of the falls, Max spotted a swift clinging to the cliff opposite us about 10m away. We had not noticed any swifts fly in, but could have missed them when our attention was diverted rock climbing. This 1st swift then shuffled up the cliff a few inches, its head disappearing into a crevice, then we noticed some fluttering movement and saw there was another swift there most hidden. Shortly afterward the 1st swift flew off to the east, reveling a 2nd swift sitting on a mud and vegetation cup nest mostly hidden in the crevice. we then watched this swift on the nest for the next 1/2 hour, and although she would shuffle around a bit she never left the nest. At around 9:10 we saw 2 or 3 other swifts start flying around the head of the falls, one landing below us, but due to the darkening conditions we could not see exactly where the others roosted. We then climbed out, trying to do so before it got to dark to see. In the morning I awoke at 5am and went to the falls, no swifts were active yet, so we returned to the truck, then at 5:03am a swift shot out of the falls twittering frantically, almost hitting Max in the head! For the next hour and 40 minutes, until we left, we would periodically see groups of 2 to 4 flying around above the falls and canyon, often chasing each other, but we did not attempt to climb the falls and observe the nest again. See http://utahbirds.org/RecCom/OutOFRange/O_2022_02.htm