HomeMy WebLinkAboutA15_Slope Stability and Landslides_Coastal Atlas50 100
150
200
2503
0
0
350500400450300 500 Source: Esri, Maxar, Earthstar Geographics, IGN, and the GIS User Community
SCMDoc ID: TeleginLaw.DabobBay.F July 2025
Topographic contours derived from DTM 107 of the WA DNR 'Olympics South OPSW 2019' LiDAR dataset.Slope grade derived using the QGIS QDAL toolset.DTM filtered and contours smoothed using the QGIS SAGA toolset.
.
Coordinate System: NAD 1983 HARN StatePlane Washington South FIPS 4602 FeetProjection: Lambert Conformal ConicDatum: North American 1983 HARN
PN: 701164005
Jefferson County tax parcels
Mapped stream
WA DNR mapped landslide feature
Coastal Atlas slope stability mapping
Unstable slope
Unstable-old slide
Unstable-recent slide 0 100 200 300 40050Feet
Proposed Driveway Improvem ents860 Twana WayJefferson County, WashingtonPN: 701164005
Slope Stability & Landslide Mapping
1 inch = 200 feet
Existing driveway
Jefferson County Code (JCC), Section 18.22.510(1): Classification/designation of landslide hazard areas (i) Areas of historic failures, such as: (A) Areas delineated by United States Department of Agruculture, Natural Resources Conservation Service as having a significant limitation for building site development; (B) Coastal areas mapped by the Washington Department of Ecology Coastal Atlas as unstable, unstable old slides, or unstable recent slides; or (C) Areas designated and mapped as quaternary slumps, earthflows, mudflows, lahars, or landslide hazards by the Washington Department of Natural Resources or the United States Geological Survey. (iii) Areas that have shown movement during the Holocene epoch (from 10,000 years ago to present) or have been underlain or covered by mass wastage debris of this epoch.
UnnamedStre a m
UnnamedStream