SEA_GEO_ShorelineSlopeStability

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator:

Washington State Department of Ecology, Shorelands and Coastal Zone Management Program

Publication_Date: 20040322

Title: SEA_GEO_ShorelineSlopeStability

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: landslide

Theme_Keyword: coast

Theme_Keyword: geologic hazard

Theme_Keyword: slope

Theme_Keyword: erosion

Theme_Keyword: marine

Theme_Keyword: sediment

Theme_Keyword: unstable slope

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: state

Place_Keyword: Puget Sound

Place_Keyword: northwest

Place_Keyword: Washington

Place_Keyword: Pacific

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 10.6.1.9270

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 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 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 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 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 1, Whatcom County

Source_Scale_Denominator: 24

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 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 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 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 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 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 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 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: SEA_GEO_ShorelineSlopeStability

Entity_Type_Definition: Attribute table

Entity_Type_Definition_Source: Ecolgy

Attribute:

Attribute_Label: HECTARES

Attribute_Definition: Hetaacres

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: ACRES

Attribute_Definition: Acreage

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: 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: 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.

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: 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: 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: 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: Uos

Enumerated_Domain_Value_Definition: Identifies post-glacial but prehistoric landslide areas.

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.

Attribute:

Attribute_Label: AREA_FEET

Attribute_Definition: Area in square feet

Attribute_Definition_Source: Ecology

Attribute:

Attribute_Label: LOCATION

Attribute_Definition: Location

Attribute_Definition_Source: Ecology

Attribute:

Attribute_Label: Shape_Length

Attribute_Definition: Length of feature in internal units.

Attribute_Definition_Source: Esri

Attribute_Domain_Values:

Unrepresentable_Domain: Positive real numbers that are automatically generated.

Attribute:

Attribute_Label: Shape_Area

Attribute_Definition: Area of feature in internal units squared.

Attribute_Definition_Source: Esri

Attribute_Domain_Values:

Unrepresentable_Domain: Positive real numbers that are automatically generated.

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: 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: 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: 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: 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: 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.

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.

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: MAPPLATE_

Attribute_Definition: Map plate number

Attribute_Definition_Source: Ecology

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: 20190611

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