Where is that Water Going? in Yellowstone National Park, Wyoming

Where is that Water Going? in Yellowstone National Park, Wyoming
The Yellowstone River flows over Upper Falls and seems to disappear in the ice sheet below. This is a pretty big falls - note the highway bridge above the falls.
Taken in Yellowstone National Park, Wyoming on Mar 2, 2013
Category Water
Camera
Canon EOS 30D
Lens
EF24-105mm f/4L IS USM
Aperture
F22
ISO
100
Focal length
60.0 mm
Program type
Aperture priority
Shutter speed
1/13 sec
Exposure bias
1 EV
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