Hummingbird skimming the water in the Arkansas River

This morning while watching the McKenzie bridge Black Phoebes, I saw a hummingbird (a female, not seen long enough for id) hover right above the water in the Arkansas River and appearing to be skimming the water surface to get a drink. The hummingbird did not appear to be catching insects located above the water and I didn't see any insect swarms at this location that was a small rapids (class I).

This behavior seemed strange since they drink so much liquid nectar. "Birds of North America" notes that Black-chinned Hummingbirds have been seen drinking from a spring but indicated that Broad-tailed or Rufous got their water needs met from nectar. Someone posted on a web forum that they watched a hummingbird skim over water to take a drink. I also found a statement on Birdfeeding.org that "Anna's hummingbirds often bathe in flight by skimming over the water," but couldn't find anything else on that."

So I don't know if the hummingbird was drinking the water, taking a bath, or what.

SeEtta