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3.8. GIS Data Available from the World Wide Web <br />A number of websites were used to gather GIS data for La Plata County. This included base <br />Table 6 <br />map data for use in the WISE Scoping Tool. below summarizes the source and types of <br />data obtained. <br />Table 6: External GIS Data Availability <br />Data Layer SourceURL <br />U.S. Census <br />Road Centerlines Bureauhttp://arcdata.esri.com/data/tiger2000/tiger_download.cfm <br />(TIGER) <br />U.S. Census <br />Railroad Centerlines Bureauhttp://arcdata.esri.com/data/tiger2000/tiger_download.cfm <br />(TIGER) <br />National <br />Stream Centerlines Hydrographyhttp://nhdgeo.usgs.gov/viewer.htm <br />Dataset <br />3.9. County / Community Supplied Data <br />GIS Availability, Mapping Needs, and Community Ordinances questionnaire forms have been <br />Appendix <br />delivered to all communities in La Plata County. The questionnaires are included in <br />B <br />. When available, community supplied GIS data is the preferred source of data by FEMA for <br />use in DFIRM map production. <br />3.10. Available DFIRM Data <br />No DFIRM data has been produced for any communities within La Plata County, Colorado. <br />4. Effective Streams within the County <br />The WISE Scoping Tool was used to delineate streams in La Plata County by the flood zones on <br />the effective FIRM panels. The results of this effort is a GIS data layer, referred to as the <br />Effective Streams layer, which contains stream reaches for each detailed and approximate <br />