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Scope/Content: Abstract: The Marmot dam, a medium-large sized dam on the Sandy River in Oregon, was removed in October 2007 to restore fi sh spawning habitat. This decommissioning project provided the opportunity to study fl uvial geomorphologic changes as affected by the release of impounded sediment behind a dam. This research project examined change in grain size distribution (GSD) in Reach B in the downstream of the Sandy River, relatively close to the dam site. Data was collected in July 2008 and compared to data collected by others in July 2007, prior to the dam removal. Seven bars in this reach were facies mapped and pebble counted using the Wolman pebble counting technique. DeVillier expected that fi ne material had already traveled downstream without deposition whereas larger grains had yet to be transported to this reach. Therefore, Reach B should not have changed signifi cantly since the dam removal. It was found that GSD of some bars changed noticeably however as a whole, Reach B had barely changed. Therefore, Reach B is fairly the same pre- and post-dam removal as yet. Scope/Content: Dam type: concrete Scope/Content: Reservoir size: 928 acre-feet. Height: 30 feet. Length: 4690 feet. Scope/Content: Date constructed: 1913. Date removed: 2007.
Pre- and post-project monitoring Sediment and channel dynamics Dams Dam retirement