GEOGRAPHIC INFORMATION

Study Reaches for the Yellowstone River Cumulative Effects Analysis

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Data Provider DTM Consulting, Inc.
Date 07/05/2016
Content Type Downloadable Data
Abstract The Yellowstone River was divided into a series of reaches as part of the 2004 Geomorphic Reconnaissance study (AGI and DTM, 2004). The reach breaks presented in that report primarily reflect changes in the channel form captured by the 2001 CIR imagery. Additional information used to define reach breaks included regional geology, topography, and locations of infrastructure and major tributary confluences. At the time of the original reconnaissance study, channel conditions prior to 2001 were not readily available to help define reach boundaries. As flowlines and banklines have since been generated for the 1950's, 1976, and 1995, the reach breaks were re-assessed, and where historic channel traces supported the shifting of a reach break, modifications were made to the original reach break location. Reach breaks for Park County were also added. The shifts most commonly reflect the relocation of a break to a position where the historic primary channels are coincident, and where changes in channel patterns are most consistent through time. Additionally, several breaks were slightly rotated to orient the break line perpendicular to the majority of channel traces. Most reach break adjustments were minor and resulted in a slight shift and/or orientation change in order to reflect the river location and characteristics for all years of data. The extended reach break lines were used to split a 5 mile buffer polygon surrounding the 2001 Primary channel. The resulting polygons were attributed with reach name and can be used to summarize data according to reach.
Purpose The river is divided into reaches that could be grouped in terms of basic form, allowing comparisons of cause-and-effect relationships, both spatially and temporally, for a given reach type. A narrative report was developed for each reach with a physical description of the landscape and the results of the cumulative effects analysis for that reach. Reaches were delineated based on river form/pattern and the level of confinement of the stream.
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Data Access https://ftpgeoinfo.msl.mt.gov/data/spatial/nonMSDI/collections/yellowstone_River_Clearinghouse/Shapefiles/Yellowstone_Reaches2016.zip
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Distribution liability The Montana State Library provides this product/service for informational purposes only. The Library did not produce it for, nor is it suitable for legal, engineering, or surveying purposes. Consumers of this information should review or consult the primary data and information sources to ascertain the viability of the information for their purposes. The Library provides these data in good faith but does not represent or warrant its accuracy, adequacy, or completeness. In no event shall the Library be liable for any incorrect results or analysis; any direct, indirect, special, or consequential damages to any party; or any lost profits arising out of or in connection with the use or the inability to use the data or the services provided. The Library makes these data and services available as a convenience to the public, and for no other purpose. The Library reserves the right to change or revise published data and/or services at any time.
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Metadata date 07/05/2016