Metadata for Channel Migration Zone of the Clark Fork, Bitterroot River to Huson, 2009 Metadata for Channel Migration Zone of the Clark Fork, Bitterroot River to Huson, 2009

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Identification Information:

Citation:

Originator: DTM Consulting, Inc.
Originator: Applied Geomorphology, Inc.
Publication date: 2009
Title:: Channel Migration Zone of the Clark Fork, Bitterroot River to Huson, 2009
Online linkage: https://msl.mt.gov/geoinfo/data/montana_channel_migration_zones/projects/clark_fork_-_bitterroot_to_huson

Abstract:

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.

Time period of content:

Calendar date: 2009
Currentness reference: publication date

Status:

Progress: Complete

Access constraints: None

Use constraints:

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.

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