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Willamette River Floodplain 100 Meter Slices Framework Maps

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  • The SLICES framework is intended for use in making decisions about conservation and restoration in the Willamette River floodplain. It makes use of distinct spatial units, called slices, for planning and tracking change in the floodplain. The first of these units are 1 kilometer long slices drawn at right angles to the floodplain, first put forward in the Willamette River Basin Planning Atlas (Ch. 8 pp. 131-147 in Hulse, Gregory and Baker 2002). The second of these units are 100m subdivisions of the original 1 km slices, with ten 100m slices in each 1 km slice. Together, they cover the entire pragmatic floodplain of the Willamette River. We define the pragmatic floodplain as the zone subject to periodic flooding that is bounded by significant infrastructure (e.g. highways, residential areas, etc.). A set of 20 PDF maps show slice boundaries and slice numbers superimposed on contemporary air photographs.
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Hydrologic Unit Code
  • 1709
Funding Statement (additional comments about funding)
  • Project funded in part by the Meyer Memorial Trust and the Oregon Watershed Enhancement Board.
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  • Version 9.0 or higher of Adobe Acrobat Reader is required to access special features in the PDF maps. Thematic map layers can be turned on and off using the Layers Pane (View > Show/Hide > Navigation Panes > Layers). Latitude & Longitude can be identified from Edit > Analysis > Geospatial Location Tool.
  • Floodplain forest and percent bank forested are derived from 30 meter resolution sources in 100 m slices 1-7907. In slices 7908-22907 floodplain forest and percent bank forested are derived from 6 foot resolution sources.
  • Projection: NAD 1983 UTM Zone 10 North
  • Aerial Photography: NAIP, 2014