Shoreline Slope Stability

Metadata also available as

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator:
Washington State Department of Ecology, Shorelands and Coastal Zone Management Program
Publication_Date: 20040322
Title: Shoreline Slope Stability
Geospatial_Data_Presentation_Form: vector digital data
Description:
Abstract:
The digital maps presented here were originally published as hard copy maps in the Coastal Zone Atlas of Washington between 1978 and 1980. Although the Atlas has been out of print for many years, the maps contain information that remain the basis for local planning decisions. After receiving multiple requests for electronic versions of portions of the Atlas, an effort was made to scan, georeference and digitize aspects of the Atlas, beginning with the slope stability maps. These maps indicate the relative stability of coastal slopes as interpreted by geologists based on aerial photographs, geological mapping, topography, and field observations. Such methods are standard, but may occasionally result in some unstable areas being overlooked and in some stable areas being incorrectly identified as unstable. Further inaccuracies are introduced to the data through the process of converting the published maps into digital format. Important land use or building decisions should always be based on detailed geotechnical investigations. This mapping represents conditions observed in the early and mid-1970s. Shorelines and steep slopes are dynamic areas 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.
Purpose:
These maps are intended to educate the public about Washington's shoreline and to guide regional land use decisions. These maps should not be used as a substitute for site-specific studies carried out by qualified geologists and engineers. The Department of Ecology assumes no liability for the data 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 therefore did not include federal military installations or Indian Reservations. The Coastal Zone Atlas was printed on a base map consisting of United States Geological Survey (USGS) 1:2400 topographic quadrangles, some of which were quite old. This information was provided for reference, but should not be used to determine current conditions, as many structures, roads, and other features have changed considerably.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19750101
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -124.605186
East_Bounding_Coordinate: -122.151281
North_Bounding_Coordinate: 49.017651
South_Bounding_Coordinate: 46.990985
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: geologic hazard
Theme_Keyword: sediment
Theme_Keyword: landslide
Theme_Keyword: unstable slope
Theme_Keyword: marine
Theme_Keyword: slope
Theme_Keyword: coast
Theme_Keyword: erosion
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Washington
Place_Keyword: Pacific
Place_Keyword: northwest
Place_Keyword: state
Place_Keyword: Puget Sound
Access_Constraints: None
Use_Constraints:
https://ecology.wa.gov/About-us/Accountability-transparency/Our-website/Copyright-information
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Washington State Department of Ecology, Shorelands and Coastal Zone Management Program
Contact_Person: Brian Lynn
Contact_Position: Coastal Ecosystem Scientist
Contact_Address:
Address_Type: mailing
Address: PO Box 47600
City: Olympia
State_or_Province: Washington
Postal_Code: 98504-7600
Country: United States of America
Contact_Voice_Telephone: (360) 407-6224
Contact_Facsimile_Telephone: (360) 407-6902
Contact_Electronic_Mail_Address: brian.lynn@ecy.wa.gov
Hours_of_Service: 0800 - 1700 Pacific
Browse_Graphic:
Browse_Graphic_File_Name:
https://fortress.wa.gov/ecy/gispublic/DataDownload/SEA_GEO_ShorelineSlopeStability.jpg
Browse_Graphic_File_Description: Simple image
Browse_Graphic_File_Type: JPEG
Data_Set_Credit:
Washington State Department of Ecology, Shorelands and Coastal Zone Management Program
Native_Data_Set_Environment: Version 6.2 (Build 9200) ; Esri ArcGIS 10.2.2.3552

Data_Quality_Information:
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Washington State Department of Ecology
Publication_Date: 19790101
Title: Washington State Coastal Zone Atlas, Volume 8, Thurston County
Type_of_Source_Media: None
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19790101
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Washington State Coastal Zone Atlas, Volume 8, Thurston County
Source_Contribution:
The source materials were the Slope Stability Maps from the Coastal Zone Atlas. These maps are depicted as a color overlay on the USGS 1:24,000 topographic quadrangle maps current in the mid- 1970's.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Washington State Department of Ecology
Publication_Date: 19790101
Title: Washington State Coastal Zone Atlas, Volume 10, Kitsap County
Type_of_Source_Media: None
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19790101
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Washington State Coastal Zone Atlas, Volume 10, Kitsap County
Source_Contribution:
The source materials were the Slope Stability Maps from the Coastal Zone Atlas. These maps are depicted as a color overlay on the USGS 1:24,000 topographic quadrangle maps current in the mid- 1970's.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Washington State Department of Ecology
Publication_Date: 19790101
Title: Washington State Coastal Zone Atlas, Volume 9, Mason County
Type_of_Source_Media: None
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19790101
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Washington State Coastal Zone Atlas, Volume 9, Mason County
Source_Contribution:
The source materials were the Slope Stability Maps from the Coastal Zone Atlas. These maps are depicted as a color overlay on the USGS 1:24,000 topographic quadrangle maps current in the mid- 1970's.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Washington State Department of Ecology
Publication_Date: 19790101
Title: Washington State Coastal Zone Atlas, Volume 5, Snohomish County
Type_of_Source_Media: None
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19790101
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Washington State Coastal Zone Atlas, Volume 5, Snohomish County
Source_Contribution:
The source materials were the Slope Stability Maps from the Coastal Zone Atlas. These maps are depicted as a color overlay on the USGS 1:24,000 topographic quadrangle maps current in the mid- 1970's.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Washington State Department of Ecology
Publication_Date: 19790101
Title: Washington State Coastal Zone Atlas, Volume 4, Island County
Type_of_Source_Media: None
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19790101
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Washington State Coastal Zone Atlas, Volume 4, Island County
Source_Contribution:
The source materials were the Slope Stability Maps from the Coastal Zone Atlas. These maps are depicted as a color overlay on the USGS 1:24,000 topographic quadrangle maps current in the mid- 1970's.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Washington State Department of Ecology
Publication_Date: 19790101
Title: Washington State Coastal Zone Atlas, Volume 3, San Juan County
Type_of_Source_Media: None
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19790101
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Washington State Coastal Zone Atlas, Volume 3, San Juan County
Source_Contribution:
The source materials were the Slope Stability Maps from the Coastal Zone Atlas. These maps are depicted as a color overlay on the USGS 1:24,000 topographic quadrangle maps current in the mid- 1970's.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Washington State Department of Ecology
Publication_Date: 19790101
Title:
Washington State Coastal Zone Atlas, Volume 11, Jefferson County
Type_of_Source_Media: None
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19790101
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation:
Washington State Coastal Zone Atlas, Volume 11, Jefferson County
Source_Contribution:
The source materials were the Slope Stability Maps from the Coastal Zone Atlas. These maps are depicted as a color overlay on the USGS 1:24,000 topographic quadrangle maps current in the mid- 1970's.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Washington State Department of Ecology
Publication_Date: 19790101
Title: Washington State Coastal Zone Atlas, Volume 7, Pierce County
Type_of_Source_Media: None
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19790101
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Washington State Coastal Zone Atlas, Volume 7, Pierce County
Source_Contribution:
The source materials were the Slope Stability Maps from the Coastal Zone Atlas. These maps are depicted as a color overlay on the USGS 1:24,000 topographic quadrangle maps current in the mid- 1970's.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Washington State Department of Ecology
Publication_Date: 19790101
Title: Washington State Coastal Zone Atlas, Volume 6, King County
Type_of_Source_Media: None
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19790101
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Washington State Coastal Zone Atlas, Volume 6, King County
Source_Contribution:
The source materials were the Slope Stability Maps from the Coastal Zone Atlas. These maps are depicted as a color overlay on the USGS 1:24,000 topographic quadrangle maps current in the mid- 1970's.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Washington State Department of Ecology
Publication_Date: 19790101
Title: Washington State Coastal Zone Atlas, Volume 1, Whatcom County
Source_Scale_Denominator: 24
Type_of_Source_Media: hardcopyPaper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19790101
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Washington State Coastal Zone Atlas, Volume 1, Whatcom County
Source_Contribution:
The source materials were the Slope Stability Maps from the Coastal Zone Atlas. These maps are depicted as a color overlay on the USGS 1:24,000 topographic quadrangle maps current in the mid- 1970s.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Washington State Department of Ecology
Publication_Date: 19790101
Title: Washington State Coastal Zone Atlas, Volume 2, Skagit County
Type_of_Source_Media: None
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19790101
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Washington State Coastal Zone Atlas, Volume 2, Skagit County
Source_Contribution:
The source materials were the Slope Stability Maps from the Coastal Zone Atlas. These maps are depicted as a color overlay on the USGS 1:24,000 topographic quadrangle maps current in the mid- 1970's.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Washington State Department of Ecology
Publication_Date: 19790101
Title: Washington State Coastal Zone Atlas, Volume 12, Clallam County
Type_of_Source_Media: None
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19790101
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Washington State Coastal Zone Atlas, Volume 12, Clallam County
Source_Contribution:
The source materials were the Slope Stability Maps from the Coastal Zone Atlas. These maps are depicted as a color overlay on the USGS 1:24,000 topographic quadrangle maps current in the mid- 1970's.
Process_Step:
Process_Description:
Slope stability maps included on image plates from the Washington State Coastal Zone Atlas were scanned, clipped and georeferenced to USGS 1:24,000 topographic quadrangle maps. Polygons indicating relative slope stability were then digitized from these georeferenced images. Separation or overlap of the plates is a result of error in the initial mapping and/or georeferencing and digitizing inaccuracies. Although the plates were digitized into one theme, seams between individual plates remain apparent. Transfer of printed material to digital format has resulted in coarser scale of resolution of the final product. A random sampling of data points (n=177) indicates a distance error between digitized polygon shoreline and the USGS 1:24,000 topographic quadrangle maps of 61.0±75.0.
Process_Date: 20040101
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Washington State Department of Ecology, Shorelands and Coastal Zone Management Program
Contact_Person: Brian Lynn
Contact_Position: Coastal Ecosystem Scientist
Contact_Address:
Address_Type: physical
Address: 300 Desmond Drive
City: Olympia
State_or_Province: Washington
Postal_Code: 98503
Country: United States of America
Contact_Voice_Telephone: (360) 407-6224
Contact_Facsimile_Telephone: (360) 407-6902
Contact_Electronic_Mail_Address: blyn461@ecy.wa.gov

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 5685

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: NAD 1983 HARN StatePlane Washington South FIPS 4602 Feet
Lambert_Conformal_Conic:
Standard_Parallel: 45.83333333333334
Standard_Parallel: 47.33333333333334
Longitude_of_Central_Meridian: -120.5
Latitude_of_Projection_Origin: 45.33333333333334
False_Easting: 1640416.666666667
False_Northing: 0.0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.0006510416666666679
Ordinate_Resolution: 0.0006510416666666679
Planar_Distance_Units: foot_us
Geodetic_Model:
Horizontal_Datum_Name: D North American 1983 HARN
Ellipsoid_Name: GRS 1980
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257222101

Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: sde.SDE.Slope_Stability
Entity_Type_Definition: Attribute table
Entity_Type_Definition_Source: Ecolgy
Attribute:
Attribute_Label: MAPPLATE_
Attribute_Definition: Map plate number
Attribute_Definition_Source: Ecology
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: AREA_FEET
Attribute_Definition: Area in square feet
Attribute_Definition_Source: Ecology
Attribute:
Attribute_Label: SLPCLASS
Attribute_Definition:
Classification abbreviation of slope stability type for each polygon
Attribute_Definition_Source: Ecology
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: S
Enumerated_Domain_Value_Definition:
Stable slopes generally rise less than 15 percent in grade, except in local areas of low groundwater concentration or competent bedrock. Stable slopes include rolling uplands and lowlands underlain by stable material such as unweathered till and/or peat deposits which, although inherently weak, have no significant slope
Enumerated_Domain:
Enumerated_Domain_Value: I
Enumerated_Domain_Value_Definition:
Intermediate slopes are generally steeper than 15 percent except where conditions such as weaker material and/or abundant groundwater exist. Identified areas include slopes of sand and gravel, till, or thin soils over bedrock which have no known failures.
Enumerated_Domain:
Enumerated_Domain_Value: U
Enumerated_Domain_Value_Definition:
Intermediate slopes are generally steeper than 15 percent except where conditions such as weaker material and/or abundant groundwater exist. Identified areas include slopes of sand and gravel, till, or thin soils over bedrock which have no known failures.
Enumerated_Domain:
Enumerated_Domain_Value: Urs
Enumerated_Domain_Value_Definition:
Identifies recent or historically active landslide areas. [Note that Urs designation is based on investigations carried out in the late 1970s; subsequent landsliding is not reflected on these maps].
Enumerated_Domain:
Enumerated_Domain_Value: Uos
Enumerated_Domain_Value_Definition: Identifies post-glacial but prehistoric landslide areas.
Enumerated_Domain:
Enumerated_Domain_Value: M
Enumerated_Domain_Value_Definition:
Modified slopes are highly modified by human activity and include areas of significant excavation or filling. Slope response to a combination of natural processes and human activities may be unpredictable.
Enumerated_Domain:
Enumerated_Domain_Value: W
Enumerated_Domain_Value_Definition:
Bodies of water surrounded by coastline. Water can be salt, fresh or brackish and no water type delineation is made. This polygon type is not in the original coastal atlas, but is a product of the digitizing process and should be excluded from any spatial tabulation of slope stability types.
Enumerated_Domain:
Enumerated_Domain_Value: In
Enumerated_Domain_Value_Definition:
Non-coastline land forms surrounded by coastline, so that polygons where formed in the digitizing process. This polygon type is not in the original coastal atlas and should be excluded from any spatial tabulation of slope stability types.
Attribute:
Attribute_Label: SLP_CLASS
Attribute_Definition: Classification of slope stability type for each polygon
Attribute_Definition_Source: Ecology
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Stable
Enumerated_Domain_Value_Definition:
Stable slopes generally rise less than 15 percent in grade, except in local areas of low groundwater concentration or competent bedrock. Stable slopes include rolling uplands and lowlands underlain by stable material such as unweathered till and/or peat deposits which, although inherently weak, have no significant slope.
Enumerated_Domain:
Enumerated_Domain_Value: Intermediate
Enumerated_Domain_Value_Definition:
Intermediate slopes are generally steeper than 15 percent except where conditions such as weaker material and/or abundant groundwater exist. Identified areas include slopes of sand and gravel, till, or thin soils over bedrock which have no known failures.
Enumerated_Domain:
Enumerated_Domain_Value: Unstable
Enumerated_Domain_Value_Definition:
Intermediate slopes are generally steeper than 15 percent except where conditions such as weaker material and/or abundant groundwater exist. Identified areas include slopes of sand and gravel, till, or thin soils over bedrock which have no known failures.
Enumerated_Domain:
Enumerated_Domain_Value: Unstable recent slide
Enumerated_Domain_Value_Definition:
Identifies recent or historically active landslide areas. [Note that Urs designation is based on investigations carried out in the late 1970s; subsequent landsliding is not reflected on these maps].
Enumerated_Domain:
Enumerated_Domain_Value: Unstable old slide
Enumerated_Domain_Value_Definition: Identifies post-glacial but prehistoric landslide areas.
Enumerated_Domain:
Enumerated_Domain_Value: Modified
Enumerated_Domain_Value_Definition:
Modified slopes are highly modified by human activity and include areas of significant excavation or filling. Slope response to a combination of natural processes and human activities may be unpredictable.
Enumerated_Domain:
Enumerated_Domain_Value: Enclosed water
Enumerated_Domain_Value_Definition:
Bodies of water surrounded by coastline. Water can be salt, fresh or brackish and no water type delineation is made. This polygon type is not in the original coastal atlas, but is a product of the digitizing process and should be excluded from any spatial tabulation of slope stability types.
Enumerated_Domain:
Enumerated_Domain_Value: Interior
Enumerated_Domain_Value_Definition:
Non-coastline land forms surrounded by coastline, so that polygons where formed in the digitizing process. This polygon type is not in the original coastal atlas and should be excluded from any spatial tabulation of slope stability types.
Attribute:
Attribute_Label: LOCATION
Attribute_Definition: Location
Attribute_Definition_Source: Ecology
Attribute:
Attribute_Label: ACRES
Attribute_Definition: Acreage
Attribute_Definition_Source: Ecology
Attribute:
Attribute_Label: HECTARES
Attribute_Definition: Hetaacres
Attribute_Definition_Source: Ecology
Attribute:
Attribute_Label: OBJECTID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape.STArea()
Attribute_Definition: Area of polygon
Attribute_Definition_Source: ESRI
Attribute:
Attribute_Label: Shape.STLength()
Attribute_Definition: Length of line
Attribute_Definition_Source: ESRI

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Washington State Department of Ecology
Contact_Person: Rich Kim
Contact_Position: Spatial Database Administrator
Contact_Address:
Address_Type: physical
Address: 300 Desmond Drive
City: Olympia
State_or_Province: Washington
Postal_Code: 98503
Country: United States of America
Contact_Voice_Telephone: (360) 407-6121
Contact_Facsimile_Telephone: (360) 407-6493
Contact_Electronic_Mail_Address: rich.kim@ecy.wa.gov
Hours_of_Service: 0800-1700 Pacific
Contact_Instructions: Perfer email
Distribution_Liability:
The Washington State Department of Ecology provides these geographic data "AS IS" WITHOUT A WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR USE, AND/OR NON-INFRINGEMENT.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
https://fortress.wa.gov/ecy/gispublic/DataDownload/SEA_GEO_ShorelineSlopeStability.zip

Metadata_Reference_Information:
Metadata_Date: 20181017
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Washington State Department of Ecology, Shorelands and Coastal Zone Management Program
Contact_Person: Brian Lynn
Contact_Position: Coastal Ecosystem Scientist
Contact_Address:
Address_Type: mailing
Address: P.O. Box 47600
City: Olympia
State_or_Province: Washington
Postal_Code: 98504-7600
Country: United States of America
Contact_Voice_Telephone: (360) 407-6224
Contact_Facsimile_Telephone: (360) 407-6902
Contact_Electronic_Mail_Address: brian.lynn@ecy.wa.gov
Hours_of_Service: 0800-1700 Pacific
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time

Generated by mp version 2.9.12 on Wed Oct 17 14:53:42 2018