It’s a repeated scenario every year: Hiker is missing. He was hiking alone. His backpack was found near a water feature. His camera is missing too. His body is (hopefully) recovered days later downstream.
It’s tempting to get that awesome waterfall photo, especially during spring run-off. The water is explosive and thrilling. But BEWARE! Those rocks that aren’t even wet are still slick and dangerous.
Yosemite is notorious for the missing photographer. Or the family that wants that spectacular portrait…and then oops, over the falls the family falls. I had a father put his 10 yr-old on a rock, turned around, the kid was gone but for one shoe. It’s heartbreaking and preventable.
Things to consider before you fall: Is the shot worth it? What’s your footwear? If it looks or seems dangerous, it is. Test the rock before you walk on it. If it feels smooth and polished, no amount of Vibram soles will save you. And leave a goodbye note on your backpack, just in case you take a tumble.
M.K. Leech 
Really great advice! I’ve learned the hard way a few times.
Glad you’re okay!