Intermittent Spring, Off and On
Bridger-Teton National Forest, Wyoming, 2009
It's easy to see that this composite of two images shows a spring under conditions of low flow and high flow, but it's more interesting to realize that I made these two images only fifteen minutes apart. Intermittent Spring, also called Periodic Spring, is thought to be the world's largest cold-water geyser. In mid to late summer, the periodicity of the spring can readily be observed; from its low-flow state, sometimes just a trickle at best, the water volume steadily increases, flows for several minutes at its maximum, and then steadily decreases to the low-flow state. And the process repeats. Photo © copyright by Greg Owens.