GIS Data Catalog
Sensitive Area Ordinance Streams
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Summary
To provide guidelines for development.
Description
Streams are defined in the Sensitive Areas Ordinance (SAO) as those areas of King County where surface waters produce a defined channel or bed.
A defined channel or bed is an area that demonstrates clear evidence of the passage of water and includes but is not limited to bedrock channels, gravel beds, sand and silt beds and defined-channel swales.
The channel or bed need not contain water year-round.
This definition is not meant to include irrigation ditches, canals, storm or surface water runoff devices or other entirely artificial watercourses unless they are used by salmonids or used to convey streams naturally occurring prior to construction in such watercourse.
Layer information
| Layer Name | saostream_line |
| Subject Category | Environment |
| Title | Sensitive Area Ordinance Streams |
| Feature Count | 5452 |
| Feature Type | Line |
| Next Update | None planned |
| Spatial reference | EPSG:2926 |
| Control ID | 180 |
| Place Keywords | Washington State, King County, WA, Pacific NW |
| Theme Keywords | Streams, Enviro, Inlandwaters |
| Supplemental Information |
King County classifies streams into the following categories: Class 1 streams are those inventoried as "Shorelines of the State" under King County's Shoreline Master Program. Class 2 streams are those smaller that Class 1 streams that flow year-round during years of normal rainfall or those that are used by salmonids. Class 3 streams are those that are intermittent or ephemeral during years of normal rainfall and are not used by salmonids. Unclassified streams are those for which a water course has been identified but for which the defining characteristics of a Class 1, 2, or 3 stream have not been determined. Further study is necessary to classify these streams. The overall policy objective for strem management in King County is no net loss of stream functions and values. A detailed description of development standards for streams is given in the Sensitive Areas Ordinance and administrative rules. For exceptions, exemptions, and mitigation procedures for streams, please refer to the SAO and administrative rules. In general, the minimum required native vegetation buffer width for each stream class as measured from the ordinary high water mark is a follows: Class 1 Streams - 100-foot buffer Class 2 Streams used by salmonids - 50-foot buffer. A study may be required to determine salmonid use. Class 3 Streams - 25-foot buffer |
Table Preview
Attribute information
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OBJECTID
From ESRI |
Description
Internal feature number. DomainSequential unique whole numbers that are automatically generated. |
|
CLASS_
From 1990 Sensitive Areas Map Folio |
Description
classifications of streams Domain1 - Shorelines of the State 2S - Smaller than Class 1 streams that flow year-round during years of normal rainfall or those that are used by salmonids. S = Salmon present 2P - Smaller than Class 1 streams that flow year-round during years of normal rainfall or those that are used by salmonids. P = Perennial stream but no salmon. 3 - Intermittent or ephemeral during years of normal rainfall and are not used by salmonids. Unclassified - A water course has been identified but for which the defining characteristics of a Class 1, 2, 3 stream have not been determined. Further study is necessary to classify these streams. |
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EDIT_DATE
From DDES |
Description
edit date DomainNot Found |
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SOURCE1
From DDES |
Description
source DomainNot Found |
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Shape
From ESRI |
Description
Feature geometry. DomainCoordinates defining the features. |
|
Shape.STLength()
From SQL Server |
Description
Returns the total length of the elements in a geometry instance. DomainDouble |
Contact information
| Maintained by | DLS - Permitting |
| Primary |
Paul McCombs
paul.mccombs@kingcounty.gov |
Terms of Use
| License | Terms of use and copyright |
Use this Data
|
Links
How to use in ArcGIS Pro |
|
| Sharing Status | Public |
Summary
To provide guidelines for development.
Description
Streams are defined in the Sensitive Areas Ordinance (SAO) as those areas of King County where surface waters produce a defined channel or bed.
A defined channel or bed is an area that demonstrates clear evidence of the passage of water and includes but is not limited to bedrock channels, gravel beds, sand and silt beds and defined-channel swales.
The channel or bed need not contain water year-round.
This definition is not meant to include irrigation ditches, canals, storm or surface water runoff devices or other entirely artificial watercourses unless they are used by salmonids or used to convey streams naturally occurring prior to construction in such watercourse.
Contact information
| Maintained by | DLS - Permitting |
| Primary |
Paul McCombs
paul.mccombs@kingcounty.gov |
Terms of use and copyright
| License | Terms of use and copyright |
Change history
| 1/1/1990 |
Sensitive Areas Map Folio compiled. The 1987 edition and earlier editions of the Sensitive Areas Map Folio used the Washington Department of Natural Resources (DNR) Water Type Maps as a basis for stream categorization. The 1990 edition uses the new stream classification system (described above) defined by the Sensitive Areas Ordinance (SAO). The DNR system is based on the potential for fish habitat as well as water use characteristics, while the SAO system depends on the actual documented existence of salmonids in a stream or documented evidence of the perennial or intermittent nature of a stream. Both classification systems define Type I or Class 1 streams as Shorelines of the State. Although the DNR Type II-VI streams may coincide with SAO Class 2, 3, and Unclassified streams, the DNR system does not translate consistently to the SAO classification system. Because the SAO classification system requires a knowledge of the actual presence or absence of salmonids, additional research was necessary on streams that had previously been mapped and on streams added to the maps. Sources used for the 1990 maps were: 1) The State Shorelines Act maps and regulations were used to identify all Class 1 streams. 2) A Catalog of Washington Streams and Salmon Utilization, published in 1975 by the Washington Department of Fisheries, and personal interviews with WDOF field biologists in 1990 provided locations of anadromous fish bearing waters, included in Class 2 streams. 3) Data from the King County Water Management Basin Reconnaissance Program maps, field notes and basin plans published since the 1987 map folio edition were incorporated. 4) Washington Department of Natural Resources Water Type Maps were used to identify streams for which fish use has not been determined but channels have been identified. The Water Type maps are the primary source for identification of Unclassified streams east of the Forest Zone line. 5) Field work was conducted from April through July, 1990, primarily in the Snoqualmie River Basin, upper Green River, and portions of the Enumclaw Plateau, areas which had not been previously surveyed intensively. The fieldwork consisted of mapping stream channels, and determining, where possible, the presence of salmonids, and whether or not the stream was perennial. |
| Update 2 |
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