HomeMy WebLinkAboutA14_Slope Characteritics Layout250 100
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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.
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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
Potential adverse geologic contact per JCC Section 18.22.510(1)(b)(ii)(B)
Slope grade (percent)
15 - 40
>40 0 100 200 300 40050Feet
Proposed Driveway Improvem ents860 Twana WayJefferson County, WashingtonPN: 701164005
Slope Characteristics Map
1 inch = 200 feet
Existing driveway
Jefferson County Code (JCC), Section 18.22.510(1): Classification/designation of landslide hazard areas
(ii) Areas where all three of the following conditions occur:(A) Slopes are steeper than 15 percent;(B) Hillsides intersecting geologic contacts with a relatively permeable sediment overlying a relatively impermeable sediment or bedrock; and(C) Spring or groundwater seepage
(ix) Areas with a slope of 40 percent or steeper and with a vertical relief of 10 or more feet, except areas composed of bedrock.