The first waterfall one sees when entering Yellowstone from the south, from Grand Teton National Park.

Boulder, Waterfall, Yellowstone National Park

Location:: Yellowstone National Park, Wyoming
Date:: July 23, 2002
Exposure:: 1/10 sec at f/11, ISO 100
Equipment:: Canon D60 + Canon 16-35 L at 16 mm

Heading north from Grand Teton Nat'l Park, this is the first waterfall I encountered, and a popular hike. The boulder in the foreground is almost at road level, while a steep hike follows the waterfall downward to a small pool where people were wading and basking in the sun.