Computer Terrain Mapping, Inc. 2005 map The Alpine Loop Road Proximity data set shows the proximity to access roads along the Loop. This data set is one of the development constraints used to determine Development Potential. Areas close to existing roadways generally have easier access and were deemed to have proportionately higher development potential than areas more distant from roadways. All public roads in the Alpine Loop study area were used in the calculation. Buffers of 400m (~1/4 mile), 800m (~1/2 mile) and 1600m (~ 1 mile) were created around each roadway to represent increasingly more difficult access to a property. The constraint rankings were as follows: 0: no constraint: < 400m 1: low constraint: 400 – 800 m from roadway 2: medium constraint: 800 – 1600 m from roadway 3: high constraint: > 1600 m from roadway 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 See Standards for Digital Line Graphs (DLG-3) Complete None Planned -107.8725478 -107.2256611 38.08819806 37.73515861 None Conservation Development Proximity 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 See Standards for Digital Line Graphs (DLG-3) Only basic spot checking based on knowledge of terrain was performed. Road proximity was calculated for the entire study area. USGS 1999 Reston, VA USGS See Standards for Digital Line Graphs (DLG-3) digital data 1956 1994 Publication date USGS DLG Location of access roads Converted vector format files to raster format. Created variable width buffers around access roads (see abstract for widths). Weighted buffer zones according to distance - closest zone lowest constraint; farthest zone highest constraint. USGS DLG 2005 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 Road proximity grid cell Any of the data elements in the road proximity map. author road proximity cell value The value is an estimate for the difficulty of access to a portion of the landscape. 0 - < 400m from roadway; 1 - 400-800m from roadway; 2 - 800-1600m from roadway; 3 - > 1600m from roadway. 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