Name: Coos_BeachesandDunes_DOGAMI_2024

Display Field: Codes

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: The objective of this study was to produce updated information on the spatial extent of beach and dune geomorphology in Coos County, Oregon that may be subject to existing and future storm-induced wave erosion, runup, overtopping, and coastal flooding. These data are of importance to the Department of Land Conservation and Development and the seven coastal counties of Oregon in order to implement Statewide Planning Goal 18: Beaches and Dunes. Oregon Statewide Planning Goal 18 requires local jurisdictions adopt a beach and dune overlay zone in their comprehensive plan, which may be used to manage development on or near beaches and dunes. Regional mapping of the coastal geomorphology of the Oregon coast to define the extent of its beaches and dunes was originally undertaken between 1972 and 1975 by the U.S. Department of Agriculture Soil Conservation Service (USDA, 1975). However, in the intervening 45 years, much has changed on the coast. Of particular importance has been the proliferation of European beach grasses that have helped stabilize many coastal dune systems, the growth and northward extension of the New River Spit, while many areas of the Coos County coastline have experienced erosion (e.g., Bastendorff Beach, North Coos Spit), especially since the late 1970s. In addition, new technologies such as lidar are now providing unprecedented levels of detail, enabling scientists to map the spatial extents of both the contemporary and historical foredune systems more accurately as well as much older inland dunes. These three factors combined necessitate that the USDA (1975) overlay zone be updated to reflect contemporary conditions. This layer defines the the spatial extent of beach and dune morphologies. [Draft] See the text from this Open-file Report O-24-XX for technical information on mapping methods and a discussion of results and interpretation.

Service Item Id: 7ef9a8eeac754405823a93fe182e251d

Copyright Text: This project was funded under award #21102 by the Oregon Coastal Management Program (OCMP) of the Department of Land Conservation and Development agency, via a National Oceanic and Atmospheric Administration (NOAA) Office for Coastal Management Special Merit Grant. We thank Rhiannon Bizore for her assistance throughout this project, discussion on approach, and constructive comments on the technical report. We also thank Meg Reed for her perseverance in finding the needed funding to complete this important update.

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Extent:

XMin: -1.3857134368464816E7
YMin: 5304926.150946811
XMax: -1.3803612730715198E7
YMax: 5405510.58411736
Spatial Reference: 102100  (3857)

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• Value: B
  Label: B - Beach
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• Value: FDA
  Label: FDA - Active foredune
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• Value: FD (W)
  Label: FDR - Reactivated, erosion/flooding
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• Value: FDR
  Label: FDR - Reactivated, erosion/flooding
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• Value: AFDA
  Label: AFDA - Artificial dune
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• Value: FED
  Label: FED - Fluvial / Estuary deposit
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• Value: H
  Label: H - Hummocks
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• Value: FD
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• Value: IFD
  Label: IFD - Inland foredune
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• Value: DS
  Label: DS - Dune, younger stabilized
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• Value: IDN
  Label: IDN - Inland dune, stabilized
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• Value: DC
  Label: DC - Dune complex
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• Value: OS
  Label: OS - Open sand
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• Value: W
  Label: W - Interdune
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• Value: WMF
  Label: WMF - Wet mountain front
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• Value: WDP
  Label: WDP - Wet deflation plain
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• Value: WL
  Label: WL - Wetland
  Description: N/A
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• Value: WSP
  Label: WSP - Wet surge plain
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• Value: WFP
  Label: WFP - Wet flood plain
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  Label: ODS - Dune, older stabilized
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  Label: JT - Jetty
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