Description

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Ecoregions by state were extracted from the seamless national shapefile. Ecoregions denote areas of general similarity in ecosystems and in the type, quality, and quantity of environmental resources. They are designed to serve as a spatial framework for the research, assessment, management, and monitoring of ecosystems and ecosystem components. These general purpose regions are critical for structuring and implementing ecosystem management strategies across federal agencies, state agencies, and nongovernment organizations that are responsible for different types of resources within the same geographical areas. The approach used to compile this map is based on the premise that ecological regions can be identified through the analysis of patterns of biotic and abiotic phenomena, including geology, physiography, vegetation, climate, soils, land use, wildlife, and hydrology. The relative importance of each characteristic varies from one ecological region to another. A Roman numeral hierarchical scheme has been adopted for different levels for ecological regions. Level I is the coarsest level, dividing North America into 15 ecological regions. Level II divides the continent into 52 regions (Commission for Environmental Cooperation Working Group, 1997). At Level III, the continental United States contains 104 regions whereas the conterminous United States has 84 (U.S. Environmental Protection Agency, 2005). Level IV ecoregions are further subdivisions of Level III ecoregions. Methods used to define the ecoregions are explained in Omernik (1995, 2004), Omernik and others (2000), and Gallant and others (1989).For more information, contact Dan Saul, Washington State Department of Ecology GIS Manager, dan.saul@ecy.wa.gov or 360-407-6419.

Dataset Attributes

  • OBJECTID_1
    Number
  • US_L4CODE
    Text
    {"value"=>"10b", "count"=>58} (), {"value"=>"77c", "count"=>40} (), {"value"=>"2c", "count"=>30} (), {"value"=>"2f", "count"=>27} (), {"value"=>"77b", "count"=>26} (), {"value"=>"1a", "count"=>12} (), {"value"=>"1d", "count"=>10} (), {"value"=>"4d", "count"=>9} (), {"value"=>"2d", "count"=>9} (), {"value"=>"4b", "count"=>8} ()
  • US_L4NAME
    Text
    {"value"=>"Loess Islands", "count"=>58} (), {"value"=>"North Cascades Subalpine/Alpine", "count"=>40} (), {"value"=>"San Juan Islands", "count"=>30} (), {"value"=>"Central Puget Lowland", "count"=>27} (), {"value"=>"North Cascades Highland Forests", "count"=>26} (), {"value"=>"Coastal Lowlands", "count"=>12} (), {"value"=>"Volcanics", "count"=>10} (), {"value"=>"Olympic Rainshadow", "count"=>9} (), {"value"=>"Cascade Subalpine/Alpine", "count"=>9} (), {"value"=>"Western Cascades Montane Highlands", "count"=>8} ()
  • US_L3CODE
    Text
    {"value"=>"2", "count"=>82} (), {"value"=>"77", "count"=>77} (), {"value"=>"10", "count"=>75} (), {"value"=>"1", "count"=>36} (), {"value"=>"15", "count"=>25} (), {"value"=>"4", "count"=>19} (), {"value"=>"11", "count"=>9} (), {"value"=>"9", "count"=>3} (), {"value"=>"3", "count"=>2} ()
  • US_L3NAME
    Text
    {"value"=>"Puget Lowland", "count"=>82} (), {"value"=>"North Cascades", "count"=>77} (), {"value"=>"Columbia Plateau", "count"=>75} (), {"value"=>"Coast Range", "count"=>36} (), {"value"=>"Northern Rockies", "count"=>25} (), {"value"=>"Cascades", "count"=>19} (), {"value"=>"Blue Mountains", "count"=>9} (), {"value"=>"Eastern Cascades Slopes and Foothills", "count"=>3} (), {"value"=>"Willamette Valley", "count"=>2} ()
  • NA_L3CODE
    Text
    {"value"=>"7.1.7", "count"=>82} (), {"value"=>"6.2.5", "count"=>77} (), {"value"=>"10.1.2", "count"=>75} (), {"value"=>"7.1.8", "count"=>36} (), {"value"=>"6.2.3", "count"=>25} (), {"value"=>"6.2.7", "count"=>22} (), {"value"=>"6.2.9", "count"=>9} (), {"value"=>"7.1.9", "count"=>2} ()
  • NA_L2CODE
    Text
    {"value"=>"6.2", "count"=>133} (), {"value"=>"7.1", "count"=>120} (), {"value"=>"10.1", "count"=>75} ()
  • NA_L2NAME
    Text
    {"value"=>"WESTERN CORDILLERA", "count"=>133} (), {"value"=>"MARINE WEST COAST FOREST", "count"=>120} (), {"value"=>"COLD DESERTS", "count"=>75} ()
  • NA_L1CODE
    Text
    {"value"=>"6", "count"=>133} (), {"value"=>"7", "count"=>120} (), {"value"=>"10", "count"=>75} ()
  • NA_L1NAME
    Text
    {"value"=>"NORTHWESTERN FORESTED MOUNTAINS", "count"=>133} (), {"value"=>"MARINE WEST COAST FOREST", "count"=>120} (), {"value"=>"NORTH AMERICAN DESERTS", "count"=>75} ()
  • STATE_NAME
    Text
    {"value"=>"Washington", "count"=>328} ()
  • EPA_REGION
    Number
    10 to 10
  • L4_KEY
    Text
    {"value"=>"10b Loess Islands", "count"=>58} (), {"value"=>"77c North Cascades Subalpine/Alpine", "count"=>40} (), {"value"=>"2c San Juan Islands", "count"=>30} (), {"value"=>"2f Central Puget Lowland", "count"=>27} (), {"value"=>"77b North Cascades Highland Forests", "count"=>26} (), {"value"=>"1a Coastal Lowlands", "count"=>12} (), {"value"=>"1d Volcanics", "count"=>10} (), {"value"=>"4d Cascade Subalpine/Alpine", "count"=>9} (), {"value"=>"2d Olympic Rainshadow", "count"=>9} (), {"value"=>"4b Western Cascades Montane Highlands", "count"=>8} ()
  • L3_KEY
    Text
    {"value"=>"2 Puget Lowland", "count"=>82} (), {"value"=>"77 North Cascades", "count"=>77} (), {"value"=>"10 Columbia Plateau", "count"=>75} (), {"value"=>"1 Coast Range", "count"=>36} (), {"value"=>"15 Northern Rockies", "count"=>25} (), {"value"=>"4 Cascades", "count"=>19} (), {"value"=>"11 Blue Mountains", "count"=>9} (), {"value"=>"9 Eastern Cascades Slopes and Foothills", "count"=>3} (), {"value"=>"3 Willamette Valley", "count"=>2} ()
  • L2_KEY
    Text
    {"value"=>"6.2 WESTERN CORDILLERA", "count"=>133} (), {"value"=>"7.1 MARINE WEST COAST FOREST", "count"=>120} (), {"value"=>"10.1 COLD DESERTS", "count"=>75} ()
  • L1_KEY
    Text
    {"value"=>"6 NORTHWESTERN FORESTED MOUNTAINS", "count"=>133} (), {"value"=>"7 MARINE WEST COAST FOREST", "count"=>120} (), {"value"=>"10 NORTH AMERICAN DESERTS", "count"=>75} ()

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