DTM Consulting, Inc. Applied Geomorphology, Inc. 2009 Helena, Montana Montana State Library https://msl.mt.gov/geoinfo/data/montana_channel_migration_zones/projects/clark_fork_-_bitterroot_to_huson A Channel Migration Zone map and associated report was completed for approximately 20 miles of the Clark Fork River from the Bitterroot River confluence, downstream to the Six Mile Creek confluence near Huson. Channel Migration Zone mapping is based on the understanding that rivers are dynamic and move laterally across their floodplains through time. Over any given time period, rivers occupy a corridor area whose width is dependent on rates of bank erosion. The map units contained in the data include the following: 1 - Active Channel: The active channel reflects the channel course in 2005. 2 - Historic Migration Zone (HMZ): This unit reflects the area where active channels of the Clark Fork River have existed between 1955 and 2005. 3 - Erosion Buffer: The erosion buffer reflects a calculated erosion buffer based on over one hundred measurements of channel migration. The main buffer is twice the mean 50-year migration rate. The larger buffer extending slightly beyond reflects twice the 75th percentile value measured for the 1955-2005 time frame. 4 - Bedrock: Geologic units that are older than the valley bottom sediments are mapped as bedrock. These areas were not assigned erosion buffers or geotechnical setbacks, as any risk of erosion in these areas is highly site-specific and beyond the realm of this study. 5 - Avulsion Hazard Zone (AHZ): Areas where topographic conditions suggest potential channel relocation or reactivation are mapped as the AHZ. These areas reflect sites where during flood events, these channels are prone to reactivation or flooding. 2009 publication date Complete -114.361805 -114.117774 47.042250 46.851262 ISO 19115 Topic Category inlandWaters geoscientificInformation environment Public safety floodplain management planning Clark Fork River Missoula County Montana None Please consult technical memo titled 'Clark Fork River CMZ Pilot,' created December 15, 2009, for Peter Nielsen at the Missoula County planning office prior to using these data for analysis. 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. Tony Thatcher Bryan Swindell DTM Consulting, Inc. physical address

211 N Grand Ave; Suite J

Bozeman MT 59715 406-585-5322 tony@dtmgis.com Karin Boyd Applied Geomorphology, Inc. physical address

211 N Grand Ave; Suite C

Bozeman MT 59715 406-587-6352 kboyd@appliedgeomorph.com State Plane Coordinate System 2500 45.000000 49.000000 -109.500000 44.250000 600000.000000 0.000000 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 Montana State Library mailing address

PO Box 201800

Helena MT 59620-1800 406-444-5354 Montana Relay 711 406-444-0266 geoinfo@mt.gov Downloadable Data 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. ESRI Personal Geodatabase https://ftpgeoinfo.msl.mt.gov/Data/Spatial/NonMSDI/Collections/CMZ/CMZ_ClarkFork2009.zip 20141201 DTM Consulting, Inc. Bryan Swindell, MSc GIS/Natural Resources Analyst mailing and physical address

211 N Grand Ave, Suite E

Bozeman MT 59715 406-585-5322 bryan@dtmgis.com FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 {11577a83-94c9-4365-ba6b-1d8401abef81}