Lombard, Pamela J. Olson, Scott A. Sturtevant, Luke P. Kalmon, Rena 20211104 Comma delimited files Pembroke, NH U.S. Geological Survey https://doi.org/10.5066/P9RINQ4B Pamela J. Lombard Scott A. Olson Luke P. Sturtevant Rena D. Kalmon 2021 publication n/a US Geological Survey https://doi.org/10.3133/sir20215109 The U.S. Geological Survey New England Water Science Center, under an interagency agreement with the Federal Emergency Management Agency, conducted frequency analyses of stillwater elevations at three National Oceanic and Atmospheric Administration coastal gages following the coastal floods of 2018. The datasets are comma-delimited files of period-of-record annual peak stillwater elevations collected at gages in Boston, Massachusetts, Portland, Maine, and Seavey Island, Maine, for analysis of annual-exceedence probabilities. The peak water-surface elevations are in feet in the North American Vertical Datum of 1988. These tidal-gaging data were compiled by the USGS New England Water Science Center for the computation of new coastal statistical stillwater elevations from Cape Cod Bay north to the New Hampshire border. The values were obtained from water level reports on the National Oceanic and Atmospheric Administration (NOAA) Center for Operational Oceanographic Products and Services (CO-OPS) website: https://tidesandcurrents.noaa.gov/stations.html?type=Water+Level+Reports Elevations were linearly detrended to 2018 sea levels using the the mean sea-level trend constant for the gage site as determined by NOAA. The trends are 2.83, 1.88, and 1.76 millimeters per year for Boston, Portland, and Seavey Island, respectively. 2018 ground condition Complete None planned -71.229858399166 -69.927978516405 43.75094115305 42.195644629532 USGS Thesaurus Ocean Characteristics USGS Metadata Identifier USGS:60100d51d34e162231fecf9e Geographic Names Information System Portland, Maine Boston, Massachusetts Seavey Island, Maine none none Scott A Olson Northeast Region: NEW ENGLAND WSC NH/VT OFC Hydrologist mailing and physical

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Pembroke NH 03275-3718 US 603-226-7815 solson@usgs.gov No formal attribute accuracy tests were conducted No formal logical accuracy tests were conducted Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. No formal positional accuracy tests were conducted No formal positional accuracy tests were conducted The recorded annual peak stillwater elevations were obtained from water level reports on the National Oceanic and Atmospheric Administration (NOAA) Center for Operational Oceanographic Products and Services (CO-OPS) website: https://tidesandcurrents.noaa.gov/stations.html?type=Water+Level+Reports 2019 Sitename_wsel_peak.csv Annual peak stillwater elevations for Portland, Boston, or Seavey Island Author year Year Producer defined Year peak Annual peak stillwater elevation Producer defined Annual peak stillwater elevation recorded at the gage upeak Annual peak stillwater elevation detrended to 2018 sea level Producer defined Annual peak stillwater elevation detrended to 2018 sea level R_analysis_script_lmom.txt Script used in R software that can be used to compute annual exceedence probabilities from the annual peak stillwater elevation datasets Author Not applicable Not applicable Not applicable Not applicable U.S. Geological Survey - ScienceBase mailing and physical

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Denver CO 80225 USA 1-888-275-8747 sciencebase@usgs.gov Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 20211104 Scott A Olson Northeast Region: NEW ENGLAND WSC NH/VT OFC Hydrologist mailing and physical

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Pembroke NH 03275-3718 US 603-226-7815 solson@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998