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SKAGIT COUNTY

POTENTIAL LANDSLIDEPOTENTIAL LANDSLIDEAND EROSION AREASAND EROSION AREAS

0 10.5

Miles

0 2,000 4,000 6,0001,000

Feet

September 14, 2016

´

T34N R 5 & 6E W.M. SHEE

T 10

Slopes

0 - 15 Percent Slope

15 - 40 Percent Slope

Greater than 40 Percent Slope

Topography

Contour Interval 20 ft.

*Soil types are identified on the Soil Survey of Skagit County as Soil units-

#1 Andic Cryochrepts#3 & #4 Andic Xerocrepts#13 Birdsview#47 & #48 Dystric Xerochrepts#50 & #51 Dystric Xerothents#63 & #65 Guemes#69 Hoogdal#90 Lithic Haploxerolls#91 Marblemount#99 Mundt#150 & #151 Typic Croyorthods

"Skagit County disclaims any warranty of merchantability or warranty offitness of this map for any particular purpose, either express or implied.No representation or warranty is made concerning the accuracy, currency,completeness or quality of data depicted on this map. Any user of this mapassumes all responsibility for use thereof, and further agrees to holdSkagit County harmless from and against any damage, loss, or liabilityarising from use of this map"

This map was created from available public records and existing map sources,not from field surveys. Map features from all sources have been adjusted to achive a "best fit" registration to the Ownership Parcels Map. While great care was taken in this process, maps from different sources rarely agree asto the precise location of geographic features. The relative positioning ofmap features to one another results from combining different map sourceswithout field "ground truthing".

Slope Stability:These maps indicate the relative stability of coastal slopes as interpreted by geologists basedon aerial photographs, geological mapping, topography, and field observations. Such methods arestandard, but may occasionally result in some unstable areas being overlooked and in some stableareas being incorrectly identified as unstable. Further inaccuracies are introduced to the datathrough the process of converting the published maps into digital format. Important land use orbuilding decisions should always be based on detailed geotechnical investigations. This mappingrepresents conditions observed in the early and mid-1970s. Shorelines and steep slopes are dynamicareas and many landslides have occurred since that time that are not reflected on these maps.Subsequent human activities may have increased or decreased the stability of some areas.

Geographic Information Services

Slope Stability Purpose: These maps are intended to educate the public about Washington's shoreline and to guide regionalland use decisions. These maps should not be used as a substitute for site-specific studies carriedout by qualified geologists and engineers. The Department of Ecology assumes no liability for thedata depicted on these maps.

Supplemental Information: Mapping of slope stability in the Coastal Zone Atlas only extends 2000 feet inland from the shoreline.Mapping was carried out only in those areas under direct state shoreline jurisdiction and thereforedid not include federal military installations or Indian Reservations. The Coastal Zone Atlas was printedon a base map consisting of United States Geological Survey (USGS) 1:2400 topographic quadrangles, some ofwhich were quite old. This information was provided for reference, but should not be used to determine currentconditions, as many structures, roads, and other features have changed considerably.

Slope information derived from USGS10-meter Digital Elevation Model (DEM)

Contour information derived from USGS10-meter Digital Elevation Model (DEM)

Shoreline Slope Stability

Wa DOE Unstable slope

Wa DOE Unstable-old slide

Wa DOE Unstable-recent slide

Other

Erosion Hazard Soils *See Note

Alluvial Fans

Coastal Landforms and Feeder Bluffs (Wa. DOE)

Feeder Bluff Excpetional

Feeder Bluff

Transport Zone

Feeder Bluff - Talus

Modified

Accretion Shoreform

Artificial (No appreciable drift)

Bedrock (No appreciable drift)

Delta (No appreciable drift)

Low Energy (No appreciable drift)

Puget Sound Feeder Bluff Shoretypes data were developed by Coastal Geologic Servicesfor the Department of Ecology as part of a project looking at feeder bluffs on Puget Sound.This project was managed at Ecology by Hugh Shipman.Funding was from the United States Environmental Protection Agency under Assistance AgreementPC 00J29801 to the Washington Department of Fish and Wildlife and was administered bythe Lead Organization for Marine and Nearshore Grants at WDFW.

Map Print Date: September 14, 2016