Computer Terrain Mapping, Inc. 2005 map The Alpine Loop floodplains data set shows floodplains along the Loop. This data set is one of the development constraints used to determine Development Potential. Floodplains were digitized from the Federal Emergency Management Agency (FEMA) Flood Insurance Rate Maps (FIRM). The Alpine Loop Spatial Analysis and Mapping Project inventoried natural and cultural resources and identified important areas where overlapping resources occur. The results from this project will provide an opportunity for area stakeholders - landowners, outdoor enthusiasts, surrounding communities, federal government agencies and local and national preservation groups - to come together to find solutions that maintain the Alpine Loop experience for future visitors and residents, while working within the framework of landowner objectives as well as local and federal government goals. The Alpine Loop Spatial Analysis and Mapping Project analyzed the Alpine Loop landscape, considering important natural and cultural resources along with the likelihood of development based upon building constraints. The Project aims to provide a planning tool for area stakeholders as they consider the variety of land management options and the future of this magnificent region. The next logical step will be to craft solutions that work within the framework of landowner desires, local and federal government land management goals, and available financial and technical resources to manage the area in a way that preserves the Alpine Loop experience for future generations. While the Alpine Loop lies within three counties - San Juan, Hinsdale and Ouray - the analytical work extended into a portion of San Miguel County. The resulting mapping and analyses will: 1. Create a spatial foundation to aid future projects in the Alpine Loop corridor; 2. Serve as a prioritization tool for evaluating the conservation potential of individual private parcels; 3. Provide the necessary framework for pursuing future funding opportunities. 2003 2005 Data were retrieved from various sources and analyzed between 2003 and 2005. See Data Quality Information for time information for source data. Complete None Planned -107.8725478 -107.2256611 38.08819806 37.73515861 None Conservation Development Floodplains None United States North America Colorado San Juan Mountains Ouray County San Juan County Hinsdale County San Miguel County Ouray Silverton Lake City None None. Computer Terrain Mapping, Inc. Ed Russell President mailing

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Boulder CO 80306 USA 303.444.1670 303.443.4856 ctm@ctmap.com 8:00-5:00 MT This data set is the product of a collaborative process between numerous agencies, organizations and interested individuals from the beautiful Alpine Loop region. GRASS version 5 on Red-Hat Linux version 8.0 exported to an ASCII Grid Determined from a variety of data sources of unknown accuracy. Data are calculated from a variety of data sources of unknown accuracy. Only basic spot checking based on knowledge of terrain was performed. Floodplains were digitized for all portions of the study area covered by FIRM mapping. There may be areas with floodplain issues not included in this mapping. National Flood Insurance Program 1978 - 1988 map Unknown Federal Emergency Management Agency FEMA is an abbreviation for Federal Emergency Management Agency. Maps identify areas of 100 and 500 year flooding and rank the hazard (flood level) in the flood area. Different regions mapped had different publication and time periods. digital data 1974 1988 Earliest initial identification to latest final revision. FEMA Flood Floodplain areas. Digitize FEMA Flood maps in the study area. Classify as 3 for 100-year flood areas with average depth of 1 foot or more, 2 for 500-year flood areas and 100-year areas with average depth of less than 1 foot or protected by levees, and 0 for areas with no known flood hazard. Convert to raster at 30m cell size. FEMA 2004 Raster Grid Cell 1256 1863 Universal Transverse Mercator 13 .9996 -105 00 00 00 00 00 500000 0 coordinate pair 30.0 30.0 METERS North American Datum of 1983 (NAD83) GRS 1980 6378137 298.257222101 Floodplain grid cell Any of the data elements in the floodplains map author floodplain cell value The value represents whether the area is in a hazardous floodplain. The value of 3 (high reduction of development potential due to floodplains) is used for 100-year flood areas with average depth of 1 foot or more, 2 (moderate reduction of development potential) for 500-year flood areas and 100-year areas with average depth of less than 1 foot or protected by levees, and 0 (no reduction of development potential) for areas with no known flood hazard. author 0 3 Computer Terrain Mapping, Inc. Ed Russell President mailing

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Boulder CO 80306 USA 303.444.1670 303.443.4856 ctm@ctmap.com Alpine Loop Spatial Analysis and Mapping Project Computer Terrain Mapping, Inc. (CTM) provides this data set as is. CTM makes no guarantee or warranty concerning the accuracy of information contained in the data. CTM further makes no warranties, either expressed or implied as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although this data has been processed successfully on computers at CTM, no warranty, expressed or implied, is made by the CTM regarding the use of this data on any other system, nor does the fact of distribution constitute or imply any such warranty. Contact distributor to receive additional copies. 200504 Computer Terrain Mapping, Inc. Ed Russell President mailing

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Boulder CO 80306 USA 303.444.1670 303.443.4856 ctm@ctmap.com 8:00-5:00 MT FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998