Climate change threatens historic coastal communities, and reducing vulnerability through adaptation will not be easy - but it is necessary. Differing values of government agencies and local communities - contingent on attitudes to risk and cultural restrictions on action - may limit the options for adaptation. This thesis analyzes policy constraints for implementing the preventive strategies of constructing levees, elevating buildings and relocating towns in historic districts in the mid-Atlantic coastal region and makes recommendations for proactive, community-based decision-making processes.