This polygon shapefile represents the worst-case scenario in sea level rise and flooding. The extreme scenrio shows sea level rise of 6.6 feet and 1 percent annual chance flooding. This layer is part of the San Mateo County Sea Level Rise Vulnerability Assessment Project. These data are intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production. County of San Mateo Information Services Department and U.S. Geological Survey. (2019). High Scenario (6.6 feet SLR), San Mateo County Sea Level Rise Vulnerability Assessment Project, 2016. County of San Mateo Information Services Department. Available at: http://purl.stanford.edu/tj222tq8651. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.