RELATED ECOLOGY PROGRAMS
Stream and river shorelines
Note: The Shoreline Management Act (SMA) uses streams and rivers interchangeably.
The official list of streams meeting the 20 cubic feet per second (cfs) mean annual flow criteria is found in rule at WAC 173-18. The list of streams in rule is superseded by those found in Ecology-approved shoreline master programs. WAC 173-18-044, adopted February 2, 2007 states:
Streams and rivers west of the Cascades crest with a mean annual flow of 1,000 cfs or greater, and east of the Cascades crest with either a mean annual flow or 200 cfs or more or the portion downstream from the first 300 square miles of drainage areas are classified as shorelines of statewide significance.
Visit Ecology's Coastal Atlas and click on SMA jurisdiction under the "Regulated Features" layer for a graphic display of streams meeting this criteria.
Download the current WAC 173-18 streams list AND the proposed list from Ecology's GIS Data. Look for "shoreline management act" in the alphabetized subject list.
List of streams
Ecology's list of streams is based on the results of three USGS regional stream flow studies with corrections based on locally supplied flow data. The spreadsheet lists the specific point at which every stream or river in the state flows at 20 cubic feet per second mean annual flow, as predicted by the USGS studies, as corrected. The spreadsheet also lists the points at which streams and rivers are determined to be shorelines of statewide significance according to the criteria provided by RCW 90.58.030(c), (d), and (e). Local governments should use the spreadsheet list as a starting point for establishing the preliminary boundaries of shoreline jurisdiction.
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