See below for aerial photo images of the Henrys Fork in the Ranch section of Harriman State Park that are overlain to compare changes within the river channel between 1987 and 2005. The release of an estimated 50 to 100 tons of sediment from Island Park Reservoir occurred in 1992. Two areas of the Ranch are shown in the video; Big Bend and Millionaires Pool. In both areas, the 1987 aerial photos seem to depict lush macrophytes and multiple complex deeper water channels, whereas the 2005 photos appear to depict more simplified habitat and sediment deposition. Brad Higginson, hydrologist with Caribou-Targhee National Forest, did all of the aerial photo work and developed the video.
A full screen viewing of this video can be seen with RealPlayer. If you have RealPlayer on your computer, then click on the pop up box that appears in the upper right corner of the video when your cursor is placed there. If you don't have RealPlayer then you can download a free version: http://www.real.com/
Friday, May 1, 2009
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