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Scope/Content: Abstract: The removal of the Sandy River's Marmot Dam in Oregon in the fall of 2007 was seen as an opportunity to quantify the effect of a large dam removal on a river. In 2007, NCED REU intern Daniela Martinez began a study to investigate its effects on downstream riparian vegetation. The purpose was to determine which bars or reaches would be most affected and how. Maps of river bar vegetation cover in three reaches of the Sandy River were created in the summers of 2007, 2008, and 2009. The changes in vegetation cover were compared to changes in grain size distribution. It was found that, generally speaking, sprout and grass cover seem to increase least often with decreasing sand fraction, and bush cover seems to increase most often with increasing sand fraction and decreasing median grain size. Reaches OB and B2 were the most changed reaches. The most vegetation changes occurred in 2008. Sprouts seem to be the most volatile type of vegetation, mainly with increases in areal coverage. How much of these changes are truly related to grain size distribution is unknown. Overall, there was not much change to riparian vegetation on the Sandy River after the Marmot Dam removal. Scope/Content: Dam type: concrete Scope/Content: Height: 30 feet. Length: 4690 feet. Scope/Content: Date constructed: 1913. Date removed: 2007.
Ecology and river restoration Pre- and post-project monitoring Dams Dam retirement