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ECA - Known Slide (Affected Property)

Published by City of Seattle ArcGIS Online | City of Seattle | Metadata Last Checked: April 20, 2026 | Last Modified: 2026-02-17
This group layer includes point, line, and polygon symbology to display the landslide event inventory. Used to implement and regulate the City of Seattle's Environmentally Critical Areas (ECA) policies. This layer includes a more comprehensive collection of slide events maintained by Shannon and Wilson via the Seattle Landslide Study which included slide data through June 1999.  The Known Slide layer was most recently updated under SDCI Director's Rule 12-2019.For more information about the definition of known slide areas, see Seattle Municipal Code section 25.09.012, Environmentally Critical Areas (ECA) definitions.Updates as needed.ECA - Known Slide (Affected Property):  A polygon feature class showing landslide event inventory. ECA - Known Slide (Initiation Point): A point feature class showing landslide event inventory. ECA - Known Slide (Scarp):  A line feature class showing landslide event inventory. 

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Complete Metadata
@type dcat:Dataset
accessLevel public
contactPoint 
                                            {
  "fn": "SDCI_SeattleCityGIS",
  "@type": "vcard:Contact",
  "hasEmail": "mailto:mapgis.mapgis@seattle.gov"
}
description <p>This group layer includes point, line, and polygon symbology to display the landslide event inventory. Used to implement and regulate the City of Seattle's Environmentally Critical Areas (ECA) policies. This layer includes a more comprehensive collection of slide events maintained by Shannon and Wilson via the Seattle Landslide Study which included slide data through June 1999. &nbsp;</p><p>The Known Slide layer was most recently updated under SDCI&nbsp;<a style='border:0px solid currentcolor; box-sizing:border-box; color:rgb(0, 121, 193); font-family:inherit; line-height:1.5; text-decoration:none;' target='_blank' href='https://www.seattle.gov/dpd/codes/dr/DR2019-12.pdf' rel='nofollow ugc noopener noreferrer'>Director's Rule 12-2019</a>.</p><p><span style='font-family:Avenir Next W01, Avenir Next W00, Avenir Next, Avenir, Helvetica Neue, sans-serif;'><font style='border:0px solid currentcolor; box-sizing:border-box; font-family:inherit; line-height:1.5;'>For more information about the definition of known slide areas, see&nbsp;</font></span><a style='border:0px solid currentcolor; box-sizing:border-box; color:rgb(0, 121, 193); font-family:inherit; line-height:1.5; text-decoration:none;' target='_blank' href='https://library.municode.com/wa/seattle/codes/municipal_code?nodeId=TIT25ENPRHIPR_CH25.09REENCRAR' rel='nofollow ugc noopener noreferrer'>Seattle Municipal Code section 25.09.012</a><font style='border:0px solid currentcolor; box-sizing:border-box; font-family:inherit; line-height:1.5;'>, Environmentally Critical Areas (ECA)&nbsp;definitions.</font></p><p><font style='border:0px solid currentcolor; box-sizing:border-box; font-family:inherit; line-height:1.5;'>Updates as needed.</font></p><p><strong>ECA - Known Slide (Affected Property)</strong>: &nbsp;A polygon feature class showing landslide event inventory.&nbsp;</p><p><font style='border:0px solid currentcolor; box-sizing:border-box; font-family:inherit; line-height:1.5;'><strong>ECA - Known Slide (Initiation Point)</strong>: </font><span style='background-color:rgb(255,255,255); color:rgb(74,74,74); font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'><span style='display:inline !important; float:none; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'>A point feature class showing landslide event inventory.&nbsp;</span></span></p><p><span style='background-color:rgb(255,255,255); color:rgb(74,74,74); font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'><span style='display:inline !important; float:none; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'><strong>ECA - Known Slide (Scarp)</strong>: &nbsp;A line feature class showing landslide event inventory.&nbsp;</span></span></p>
distribution 
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identifier https://www.arcgis.com/home/item.html?id=f353794bcd1e4ddfa04097c9052e07df&sublayer=1
issued 2026-01-05
keyword 
                                            [
  "eca",
  "environmental",
  "landslide",
  "landuse",
  "planning",
  "sdci",
  "seattle gis open data",
  "slide"
]
landingPage https://data-seattlecitygis.opendata.arcgis.com/datasets/SeattleCityGIS::eca-known-slide-affected-property
modified 2026-02-17
publisher 
                                            {
  "name": "City of Seattle ArcGIS Online",
  "@type": "org:Organization"
}
spatial -122.4163,47.4992,-122.2554,47.7333
theme 
                                            [
  "geospatial"
]
title ECA - Known Slide (Affected Property)

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