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Response of Riparian Vegetation to the Removal of the Marmot Dam on the Sandy River, Oregon - POSTER
Kiernan Folz Donahue, Daniela Martinez, Charles Podalak, Dr.Peter Wilcock
Date Created and/or Issued
Contributing Institution
UC Riverside, Library, Water Resources Collections and Archives
Clearinghouse for Dam Removal Information (CDRI)
Rights Information
Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user.
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, NCEDREU 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 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 does not increase with decreasing sand fraction, and bush cover seems to increase with increasing sand fraction and decreasing mean grain size. Reach OB was the most changed reach. The most vegetation changes occurred in 2008. Sprouts seem to be the most affected type of vegetation, mainly with increases in areal coverage. How much of this change is truly related to grain size distribution is unknown.
Scope/Content: Dam type: concrete
Scope/Content: Height: 30 feet. Length: 4690 feet.
Scope/Content: Date constructed: 1913. Date removed: 2007.
Pre- and post-project monitoring
Sediment and channel dynamics
Dam retirement
Sandy River, OR

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