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Scope/Content: Abstract: The removal of the Marmot Dam was an attempt made by Portland General Electric (PGE) to restore the Sandy River, OR to its natural state. After the removal, the Sandy River underwent numerous changes. Some of the various changes occurred and are occurring in the elevation of the river's banks, bars, islands, etc. To observe these elevation changes, scientists have collected Light Detection and Ranging (LIDAR) data for the years 2006-2008. When the scientists collected this data, they did it with the expectation that the data was as accurate as possible. However, how well do LIDAR data's yearly measured elevations of unmoving structures compare? It is imperative to know the amount of height differentiation that is due to technique and how much is genuine change of the Earth's surface. This project requires the use of ArcGIS to make these comparisons. The end result of this project will determine possible sources of uncertainty in LIDAR data and any uncertainty to the foot in the Revenue Bridge area LIDAR data of the Sandy River. Scope/Content: Dam type: concrete Scope/Content: Reservoir size: 928 Height: 30 feet Length: 4,690 feet Scope/Content: Date constructed: 1908. Date removed: 2008.
Pre- and post-project monitoring Dams Dam retirement