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Our inventory process began by consolidating Washington County and Metro natural resource inventory maps. We then adjusted this consolidated map to show the natural resources that remain significant. Next, we did a manual review and data cleanup. Finally, we added data that was acquired in more recent planning studies for areas added to the Urban Growth Boundary after the County’s original Inventory was created.    


A. We started with County and Metro maps for natural resources:

We overlaid and consolidated these two sets of map data.

B. We adjusted the consolidated map to show the natural resources that remain significant. To do this we removed:

  • Developed areas (with paving or buildings) or areas already evaluated under County SNR regulations and Clean Water Services Environmental Review
  • Isolated patches of upland wildlife habitat less than 2 acres if not connected to other significant habitat


We retained upland wildlife habitat patches less than 2 acres when they:

  • Were located in a public park or open space
  • Overlapped with Oregon Department Fish and Wildlife Priority Habitat Connectivity Areas, Intertwine Alliance Oak Patch layer, and/or Intertwine Habitat Connectivity Model result


C. We conducted a manual review and data cleanup to remove habitat where:

  • Aerial photo clearly showed developed areas
  • Habitat “slivers” resulted from slight misalignment of underlying data sources 


Consolidated map after adjustment for significance and data cleanup: