U.S. Geological Survey
Data Series 236
Version 1.0

Seaside, Oregon, Tsunami Pilot Study—Modernization of FEMA Flood Hazard Maps: GIS Data

Historic Shorelines

Data layers containing historic shorelines of the Seaside, Oregon, area are provided in vector format. The data were developed to analyze accretion and erosion trends along the dynamic Seaside and Necanicum River coast (Venturato, 2005).

(A) Historic shoreline depicting the apparent Mean High Water line based on orthophotography obtained from the University of Oregon.

Historic shoreline of the Seaside, Oregon area

(B) Accretion and erosion trends of the Necanicum River mouth over a 55-year period.Accretion and erosion trends
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