English: Shows the major changes in hydrology of Mt. Saint Helens after its 1980 eruption, including artificial modifications designed to mitigate sediment and water flow.
Location: 46.289797 , -122.35405 Contours are at 200 foot intervals. Orthoimagery and contour data are from the USGS and National Map catalog. Surface structures are sourced from USGS orthoimagery and tunnels and physical features are derived from USGS topographic maps.
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