ECA - Steep Slope

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.
Organization: City of Seattle
Organization URL: https://catalog.data.gov/organization/seattle-wa
Last updated: 2026-03-02
Tags: eca, environmental, landuse, planning, sdci, seattle gis open data