Fourleague Bay to Sabine LakemetersNavigable AreaCoastal Protection and Restoration AuthorityProjected UTM 152021-07-13W005672019-06-052019-12-12Pacific Hydrographic BranchMean Lower Low WaterSyed M. Khalil2021-07-13LouisianaAny revisions to the Descriptive Report (DR) applied during office processing are shown in red italic text. The DR is maintained as a field unit product, therefore all information and recommendations within this report are considered preliminary unless otherwise noted. The final disposition of survey data is represented in the NOAA nautical chart products. All pertinent records for this survey are archived at the National Centers for Environmental Information (NCEI) and can be retrieved via https://www.ncei.noaa.gov/. Products created during office processing were generated in NAD83 UTM 15N, MLLW. All references to other horizontal or vertical datums in this report are applicable to the processed hydrographic data provided by the field unit.Southwest LouisianaNorth American Datum 1983SSSEdgeTech4200SBESODIM Brooke OceanEchotrac MKIII2019ESD-PHB-21VDatum20000Bathymetric soundings were positioned with ERS. The original horizontal datum was Louisiana State Plane Coordinate System, South Zone, North American Datum of 1983 (NAD83) and the original vertical datum was NAVD88, relative to geoid 12a.All data were reviewed for DTONs and none were identified in this survey.Louisiana Coastal Protection and Restoration Authorityhttps://cims.coastal.louisiana.gov/RecordDetail.aspx?Root=0&sid=24362A 4-meter BAG was created for data archival and charting purposes. This survey does meet charting specifications and is adequate to supersede prior data.The System Wide Assessment and Monitoring Program (SWAMP) was implemented by the Coastal Protection and Restoration Authority (CPRA) to ensure that a comprehensive network of coastal data collection activities is in place to support the development and implementation of Louisiana’s coastal protection and restoration projects and programs. The data are essential for modeling needs, oyster resource delineations, pipeline delineation and most importantly for sediment exploration to support Louisiana’s marsh and barrier island restoration projects.All survey systems and methods utilized during this survey were as described in the System Wide Assessment and Monitoring Program (SWAMP) Phase IV Report available at the URL below.2021-07-13Louisiana Coastal Protection and Restoration AuthorityGeologist Assistant AdministratorSyed M. KhalilPHBPacific Hydrographic Branch