On the Black Rapids Glacier in the Eastern Alaska Range. Eventually the slushy blue streaks in the snow from a few days before this gave way to water channels in the ice beneath the surface. Sometimes they find old channels from previous years, sometimes they don't.
In the summer of 2014 we spent two weeks camped on the glacier and had to cross many of these streams. It was still early in the melt season which meant that there weren't any moulins yet to drain the water for the surface. This meant that to get across the glacier we had to jump over many of these streams, a handful of which were quite wide.
My knees would often be swollen and sore at the end of the day. I was always more comfortable jumping to my dominant, right leg, but when I didn't mix it up I paid for it later. I started jumping all the small streams to my left leg, and only to my right if there were consequences for missing a jump.