1.0 FGDC <span style="-webkit-text-stroke-width:0px;display:inline !important;float:none;font-style:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-weight:400;letter-spacing:normal;orphans:2;text-align:start;text-decoration-color:initial;text-decoration-style:initial;text-decoration-thickness:initial;text-indent:0px;text-transform:none;white-space:normal;widows:2;word-spacing:0px;">This data release provides a geodatabase of a newly mapped shoreline for tidally influenced areas of Puget Sound, Washington, along with the source information used in its development. The shoreline is represented as a hybrid reference line that integrates geomorphic and anthropogenic controls on shoreline position. In unmodified areas, the shoreline is delineated at the approximate location of the ordinary high-water mark (OHWM). In areas where OHWM could not be identified, along rocky shores and embayments, shoreline was delineated at the approximate location of mean higher high water (MHHW) or at the potential tidally influenced extent (50% tidal exceedance elevation), respectively. In areas where human-built features modify the shoreline and alter sediment transport processes, the reference line is mapped at the toe (lowest seaward extent) of the modification. Shoreline modifications are human developments that impede natural beach and tidal processes along the shore. These include, but are not limited to, shoreline armor, boat ramps, levees, and shoreline-adjacent buildings. Overwater structures are evaluated based on their influence on sediment transport. Structures supported by pilings that are sufficiently dense to obscure through-structure visibility in on-the-water imagery are interpreted as restricting sediment movement and are therefore treated as shoreline modifications, with the reference line mapped at their seaward edge. In contrast, structures that allow clear visibility beneath them are considered permeable to sediment transport; in these cases, the shoreline is mapped landward of the structure at the approximate location of the OHWM. Attributes included with the shoreline reference line describe the presence and characteristics of shoreline modifications. These include the type of modification, the material composition of the modification, and the elevation of the modification relative to mean higher high water (MHHW). Additional attributes quantify mapping uncertainty (low, medium, high), including confidence in the presence and classification of shoreline modifications and the positional confidence of the mapped features. This hybrid mapping approach is intended to provide a consistent and process-informed representation of the shoreline position that reflects both natural geomorphic conditions and the functional footprint of human modifications. UserComments 2026-05-01T00:00:00 Lacey WA 98503 Washington State Department of Ecology 0.00 0.00 0.00 0.00 360-degree on-water imagery Survey123 Shoreline Ordinary High Water Mark Mean Higher High Water Modification Armor Data source imagery lidar Shoreline Modification Armor Coastal Management Mean Higher High Water MHHW Ordinary High Water Mark OHWM Armor Material Armor Condition Modification Type Feature class designed to allow user comments that can be tracked and responded to as-needed by Ecology staff. Stefankiv, O., Drummond, H., Dietrich, J., Alexander, K., 2026, Marine shoreline condition survey - Puget Sound shoreline modifications, Washington (ver. 1.0, May, 2026): Washington State Department of Ecology, https://gis.ecology.wa.gov/portal/apps/experiencebuilder/experience/?id=42fc9c8cf4b3498e8b6d44230c9f470a <span style="-webkit-text-stroke-width:0px;display:inline !important;float:none;font-style:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-weight:400;letter-spacing:normal;orphans:2;text-align:start;text-decoration-color:initial;text-decoration-style:initial;text-decoration-thickness:initial;text-indent:0px;text-transform:none;white-space:normal;widows:2;word-spacing:0px;">Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. https://ecology.wa.gov/about-us/accountability-transparency/website-information/copyright-information Lacey WA 98503 Katherine Alexander 1