GEOGRAPHIC INFORMATION

Channel Migration Zone of Deep Creek, 2016

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Data Provider DTM Consulting, Inc.
Applied Geomorphology, Inc.
Date 2016
Content Type Downloadable Data
Abstract The Deep Creek 100-year CMZ was completed in 2016 and extends from the US Forest Service Boundary in Deep Creek Canyon downstream to its confluence with the Missouri River. The Deep Creek CMZ is defined as the combined area that includes:- Historic Migration Zone (HMZ) – the area of historic channel occupation, usually defined by the available photographic record.- Erosion Hazard Area (EHA) – the area outside the HMZ susceptible to channel occupation due to channel migration or mass wasting.- Avulsion Hazard Zone (AHZ) – floodplain areas geomorphically susceptible to abrupt channel relocation. - Restricted Migration Area (RMA), areas of CMZ isolated from the current river channel by constructed bank and floodplain protection features (also known as the Disconnected Migration Area, or DMA).The historic and modern positions of Deep Creek were determined through a GIS-based analysis of aerial photography. The resulting mosaic of historic channel locations forms the foundation for the CMZ delineation. Within the GIS, the digitized banklines were evaluated in terms of discernible channel shift since 1947. Where migration was identifiable, vectors were drawn in the GIS to record that change. At each site of bankline migration, three measurements were collected, and the vectors were attributed with reach, eroding site identification, and line length. These measurements were then summarized by site and by reach to determine appropriate reach-specific buffer widths to accommodate future shifts in channel location.The reach-specific buffer was then applied to the 2013 banklines to define the Erosion Hazard Area. Potential avulsion pathways outside the HMZ and EHA were then added to the composite CMZ.The project was sponsored by the Deep Creek Landowner Advisory Group, Broadwater Conservation District, and Department of Fish, Wildlife and Parks. Funding was provided through grants from the Montana Department of Environmental Quality and the Montana Department of Natural Resources and Conservation. The work was performed by Applied Geomorphology and DTM Consulting.
Purpose Define the composite Channel Migration Zone for Deep Creek.
Supplemental Information
The corridor delineations presented in this geodatabase are intended to provide a basic screening tool to help guide and support management decisions. The expanse of the project area requires that the results are broad-scale in nature, and therefore less precise than highly detailed site-specific analyses. The results are unequivocally not intended to replace or override site-specific assessments; conversely, they are intended to highlight areas that would warrant such assessments as necessary. 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 https://msl.mt.gov/geoinfo/data/montana_channel_migration_zones/projects/deep_creek
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 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 04/25/2023

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