Coastal areas are essential to our nation’s economic, cultural, and environmental health, yet by nature are changing constantly due to a variety of events and processes. Extreme storms can cause dramatic changes to our shorelines in a matter of hours, while sea-level rise can fundamentally change coastal environments over decades. Often, these changes have a devastating impact on developed areas, such as the loss of homes built on retreating cliffs or dunes eroded by hurricane waves. Sometimes changes can be positive, like when new habitat is created by storm deposits. The need for scientific understanding of how our coasts respond to different hazards is clear. The USGS Coastal and Marine Geology Program is meeting this need with ongoing assessments of change and vulnerability to future change along coastlines in the United States. Through the National Assessment of Coastal Change Hazards (NACCH), the program carries out the unique task of quantifying coastal change hazards along open-ocean coasts in the U.S. and its territories. Coastal communities, emergency managers, and other stakeholders can use the science-based data, tools, models, and other products to enhance coastal resilience.