Web services > LiDAR > Washington (State)--Seattle > 2020-2024

ECA Steep Slope [Washington (State)--Seattle]

Seattle GeoData · 2024 Full Details

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Full Details

Title
ECA Steep Slope [Washington (State)--Seattle]
Description
Displays areas with 40% steep slope or greater in the City of Seattle. A polygon feature class showing areas with an incline of 40% or more (10 feet of vertical rise over a horizontal distance of 25 feet or less) with a height of at least 10 feet. This layer was produced using a combination of 2001 LIDAR contours (Puget Sound LIDAR Consortium) and the 1993 topographic contours from aerial photos. The Steep Slope layer was most recently updated under SDCI Director's Rule 12-2019 . The steep slope area map is called "advisory" because the mapping is used by the Seattle Department of Construction and Inspections for initial information and screening. Whether or not a site is eventually treated as an environmentally critical area is based on the actual topography of the ground surface. For more information about the definition of steep slope erosion hazard areas, see Seattle Municipal Code section 25.09.012 , Environmentally Critical Areas (ECA) definitions. Because of the size of this dataset, we do not recommend trying to download it. Please use as a service. If you need a particular area extracted, please use this form to make a request: City of Seattle GIS Data Request Updated as needed.
Creator
City of Seattle ArcGIS Online
Publisher
Seattle GeoData
Temporal Coverage
Last Modified: 2024-08-08
Date Issued
2023-07-06
Rights
The City of Seattle makes no representation or warranty as to its accuracy, and in particular, its accuracy as to labeling, dimensions, contours, property boundaries, or placement or location of any map feature thereof.
Access Rights
Public
Format
ArcGIS FeatureLayer
Language
English
Date Added
August 10, 2025
Provenance Statement
The metadata for this resource was last retrieved from Seattle GeoData on 2026-02-08.

Links

Cite and Reference

  • Citation
    City of Seattle ArcGIS Online (2023). ECA Steep Slope [Washington (State)--Seattle]. Seattle GeoData. https://data-seattlecitygis.opendata.arcgis.com/datasets/SeattleCityGIS::eca-steep-slope-1 (web service)
  • BTAA Geoportal Link

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