GEOGRAPHIC INFORMATION

Channel Migration Zone of the Clark Fork, Plains Reach, 2014

Data Provider RESPEC Consulting and Services
Date 05/14/2014
Content Type Downloadable Data
Abstract The Clark Fork, Plains Reach Channel Migration Zone analysis was conducted in 2014. The project covers 8.0 miles of the Clark Fork from Henry Creek to Lynch Creek around the town of Plains in western Montana. The project was sponsored by the Montana DNRC Renewable Resource Planning Grant Program, Sanders County, and the Middle Clark Fork River Plains Reach Recovery Committee. The work was performed by the Bozeman office of RESPEC Consulting and Services.The Channel Migration Zone analysis for the Plains Reach includes an assessment of the Historical Migration Zone, the development of an Erosion Buffer, identification of Avulsion Potential Areas, and incorporation of Restricted Migration Areas. For the Plains Reach, the Historical Migration Zone was delineated by digitizing the active channel margin in 1995, 2005, and 2013 in GIS using aerial imagery. The active channel includes both the mainstem and side channels, along with exposed gravel bars. In addition, historical aerial imagery was used to estimate the outer extent of the channel margin between 1955 and 1995. The Erosion Buffer was developed for a 100 year planning period using retreat rates measured within the Plains Reach between 1995 and 2013. Avulsion Potential Areas were delineated based on overflow channels and floodplain swales identified using a 3-Meter DEM from 1999 and on-the-ground observations. The Restricted Migration Area was delineated along riprap, levees, roads and railroads, which were identified through an analysis of aerial imagery and on-the-ground observations.This geodatabase contains the historic migration zone, channel migration zone buffer, and avulsion potential areas that were designated by the study. It also contains the man-made riprap and levee lines and geological valley control features that limit channel migration. The positions of the active stream channel, gravel bars, and islands digitized from aerial photographs of 1995, 2005, and 2013 are included.The CMZ is an estimate of the area in which future channel migration might occur and can be used for planning development and land management activities within the identified area. The CMZ is not intended to be used for regulatory purposes.The data are distributed with the "Clark Fork River Plains Reach Assessment and Restoration Prioritization" report that describes the processes used to create the data.
Purpose A Channel Migration Zone (CMZ) analysis was conducted along the Plains Reach of the Clark Fork to examine historic channel migration and evaluate future channel migration scenarios.
Supplemental Information
The CMZ is an estimate of the area in which future channel migration might occur and can be used for planning development and land management activities within the identified area. The CMZ is not intended to be used for regulatory purposes. 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.
Data Access http://geoinfo.msl.mt.gov/Home/data/montana_channel_migration_zones/projects/clark_fork_-_plains_area.aspx
Distributor Montana State Library
PO Box 201800
Helena, MT 59620-1800
Telephone: 406-444-5354
TDD/TTY: Montana Relay 711
Fax: 406-444-0266
Email: geoinfo@mt.gov
Distribution liability The CMZ is an estimate of the area in which future channel migration might occur and can be used for planning development and land management activities within the identified area. The CMZ is not intended to be used for regulatory purposes. 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 12/12/2014