{ "id": "268", "displayName": "Hydric Soil", "shortDisplayName": null, "description": "\n\nThis\ndata layer is an element of the Oregon GIS Framework. This data set is a\ncombined coverage including detailed SSURGO data where available, and STATSGO\ndata where SSURGO data is not available. Consult the web soil survey website\nfor complete metadata for SSURGO soil surveys and the State Soil Geographic\n(STATSGO) data set (http://websoilsurvey.sc.egov.usda.gov/App/HomePage.htm).\nSTATSGO abstract: This data set consists of general soil association units. It\nwas developed by the National Cooperative Soil Survey and supersedes the State\nSoil Geographic (STATSGO) data set published in 1994. It consists of a broad\nbased inventory of soils and nonsoil areas that occur in a repeatable pattern\non the landscape and that can be cartographically shown at the scale mapped.\nThe data set was created by generalizing more detailed soil survey maps. Where\nmore detailed soil survey maps were not available, data on geology, topography,\nvegetation, and climate were assembled, together with Land Remote Sensing\nSatellite (LANDSAT) images. Soils of like areas were studied, and the probable classification\nand extent of the soils were determined. Map unit composition was determined by\ntransecting or sampling areas on the more detailed maps and expanding the data\nstatistically to characterize the whole map unit. This data set consists of\ngeoreferenced vector digital data and tabular digital data. The map data were\ncollected in 1-by 2-degree topographic quadrangle units and merged into a\nseamless national data set. It is distributed in state/territory and national\nextents. The soil map units are linked to attributes in the National Soil\nInformation System data base which gives the proportionate extent of the\ncomponent soils and their properties. SSURGO abstract: This data set is a\ndigital soil survey and generally is the most detailed level of soil geographic\ndata developed by the National Cooperative Soil Survey. The information was\nprepared by digitizing maps, by compiling information onto a planimetric\ncorrect base and digitizing, or by revising digitized maps using remotely\nsensed and other information. This data set consists of georeferenced digital\nmap data and computerized attribute data. The map data are in a soil survey\narea extent format and include a detailed, field verified inventory of soils\nand miscellaneous areas that normally occur in a repeatable pattern on the\nlandscape and that can be cartographically shown at the scale mapped. A special\nsoil features layer (point and line features) is optional. This layer displays\nthe location of features too small to delineate at the mapping scale, but they\nare large enough and contrasting enough to significantly influence use and\nmanagement. The soil map units are linked to attributes in the National Soil\nInformation System relational database, which gives the proportionate extent of\nthe component soils and their properties. For data quality, attribute accuracy,\nand process steps, see detailed metadata available from Web Soil Survey\n(http://websoilsurvey.sc.egov.usda.gov/App/HomePage.htm). For detailed table\nand column descriptions see SSURGO/STATSGO2 Structural Metadata and\nDocumentation:\nhttp://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/home", "connectionString": "url=https://maps.dsl.state.or.us/arcgis/rest/services/SWISoil23/MapServer", "copyright": "R. Sounhen", "hasAttributionData": false, "serviceType": "Dynamic", "serviceFunction": "Operational", "baseMapGroup": null, "baseMapGroupIndex": "", "baseMapGroupIsMutuallyExclusive": false, "opacity": 1, "visible": true, "initiallyVisible": true, "drawingBehavior": "MapService", "iconUri": null, "includeInLayerList": true, "defaultAllowSymbolization": true, "isExpanded": true, "updateInterval": null, "dataProvider": null, "disableClientCaching": false, "serviceTag": "st4hqGVf+ytA7bICEbzvucQXsKT9XCUXVKxoF2d/PtI=", "identifiable": null, "includeMosaicDatasetValues": null, "includeCatalogItems": null, "includeInLegend": null, "startTime": null, "endTime": null, "serverVersion": "11.2", "failureAction": "Ignore", "failureTimeout": 4, "requestEncoding": null, "supportsDynamicLayers": true, "hasLayerCatalog": false, "format": null, "themeSettings": [], "layerHyperlinks": [], "tileInfo": {}, "instantSearch": false, "layers": [ { "id": "0", "name": "SWI Predominantly Hydric Soil Map Units", "nativeID": "0", "displayName": "Predominantly Hydric Soil Map Units", "description": "The US Department of Agriculture’s (USDA) Natural Resources Conservation Service (NRCS) develops soil surveys that include maps of soils and related reports. Extensive field work is done to complete the mapping and document findings. The maps consist of outlined areas called map units. These are areas with generally similar soils, or a similar mix of soil types that can be consistently identified across the landscape. When more than one named soil occurs in a map unit, each soil is called a component of the map unit. Each component makes up a certain percentage of the map unit. Two subsets of the soils dataset are helpful in predicting the presence of wetlands and are included in the SWI.
Some soils naturally retain water longer than others, especially when they occur on certain parts of the landscape, such as depressions. These soils often exhibit characteristics (e.g. routinely flooded) that meet the definition of, and they are designated as “hydric soils.” (NRCS Hydric Soils List Criteria https://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/use/hydric/?cid=nrcs142p2_053959) Because of these characteristics hydric soils are often found on the landscape where wetlands occur.
The SWI shows soil map units that are comprised of predominantly (greater than 50%) hydric soil components. This means that a user can expect more than half of that soil map unit to include soil components that have been designated as hydric. These map units indicate places across the landscape with a higher likelihood for wetland occurrence. Displaying predominantly hydric soil map units in the SWI is especially helpful in recognizing potential wetland areas in places where only the NWI wetland mapping is available.

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As with the other map layers in the SWI, there may be areas of predominately hydric soil map units and Agate-Winlo soil that do not contain wetlands, and wetlands will occur in soil map units with less than 50% hydric components. The presence of predominantly hydric soil map units or Agate-Winlo soil helps planners, landowners, and others recognize where further site assessment is needed.
The dataset used for the SWI is a combined SSURGO/STATSGO dataset created by NRCS for the State of Oregon Department of Administrative Services Geographic Enterprise Office (DAS GEO). DSL will download the dataset annually and symbolize the data to display the two described subsets for viewing on December 1. See directions to connect to or download and configure datasets in your GIS environment at the top of this document or on the main SWI webpage.
Some soils naturally retain water longer than others, especially when they occur on certain parts of the landscape, such as depressions. These soils often exhibit characteristics (e.g. routinely flooded) that meet the definition of, and they are designated as “hydric soils.” (NRCS Hydric Soils List Criteria https://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/use/hydric/?cid=nrcs142p2_053959) Because of these characteristics hydric soils are often found on the landscape where wetlands occur.
The SWI shows soil map units that are comprised of predominantly (greater than 50%) hydric soil components. This means that a user can expect more than half of that soil map unit to include soil components that have been designated as hydric. These map units indicate places across the landscape with a higher likelihood for wetland occurrence. Displaying predominantly hydric soil map units in the SWI is especially helpful in recognizing potential wetland areas in places where only the NWI wetland mapping is available.

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