Address:
Addresses are in standard postal format: '123 S 1ST ST W' Search Example: '123' or '123 main' or 'main' or '123 s 1st'

Geocode:

• Layers
• CMZ Layers
• Basemaps
• Bookmarks

Welcome to the Channel Migration Zone (CMZ) Web App

• The boundaries developed on the Channel Migration Zone mapping are intended to provide a basic screening tool to help guide and support management decisions within the mapped stream corridor and were not developed with the explicit intent of providing regulatory boundaries or overriding site-specific assessments. The criteria for developing the boundaries are based on reach scale conditions and average historic rates of change. The boundaries can support river management efforts, but in any application, it is critical that users thoroughly understand the process of the CMZ development and its associated limitations. Primary limitations of this reach-scale mapping approach include a potential underestimation of migration rates in discrete areas that are eroding especially rapidly, which could result in migration beyond the mapped CMZ boundary. Additionally, site-specific variability in alluvial deposits may affect rates of channel movement. Mapping errors introduced by the horizontal accuracy of the imagery, digitizing accuracy, and air photo interpretation may also introduce small errors in the migration rate calculations. Future shifts in system hydrology, climate, sediment transport, riparian corridor health, land use, or channel stability would also affect the accuracy of results, as these boundaries reflect the extrapolation of historic channel behavior into the future. As such, we recommend that these maps be supplemented by site-specific assessment where near-term migration rates and/or site geology create anomalies in the reach-averaging approach, and that the mapping be revisited in the event that controlling influences change dramatically. A site-specific assessment would include a thorough analysis of site geomorphology, including a more detailed assessment of bank material erodibility, both within the bank and in adjacent floodplain areas, consideration of the site location with respect to channel planform and hillslope conditions, evaluation of influences such as vegetation and land use on channel migration, and an analysis of the site-specific potential for channel blockage or perching that may drive an avulsion.

Moving Around
To move the map press and hold the left mouse button on top of the map to drag it in the desired direction. You can zoom in or out using your mouse center scroll wheel, or alternatively using the zoom in/zoom out buttons in the lower left corner of the map. Double-clicking the left mouse button will zoom into the map one step.

Search
To search for an address enter it into the 'Address' search box in the upper left corner of the map. Press the enter key to begin your search. If an address is found in the database a list will be presented. Click the 'Zoom' link next to the address of interest to show the address.

Additional Layers
You can change the layers shown in the map by opening the 'Layers' dialog. From here you can toggle the various layers such as Roads, Address Points and City/County boundaries. You can view the map legend by clicking the 'Legend' tab. You can also bookmark your location in the 'Bookmarks' tab.

Contact
Missoula City/County Health Department