If you are new to the MapServer you may want to read this quick tutorial.
Custer County GIS data may be downloaded here.
If you are using a smart phone or tablet you might want to use the Mobile Mapserver
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This map/data is provided by Custer County, Idaho is for display purposes only. Custer County invokes its sovereign and governmental immunity in allowing access to or use of this data, and makes no warranties as to the validity, and assumes no liability associated with the use or misuse of this information. The Flood Zones shown on this map were produced by the Idaho Department of Water Resources and are only approximate. The official flood hazard zones are defined by the FEMA Flood Insurance Rate Map (FIRM) Panels.