The COAST Act increases federal funding for emergency shoreline and streambank protection projects from $25 million to $45.5 million per year. The legislation expands what types of structures and areas qualify for this protection funding to include public recreational assets, public lands, and parks, in addition to existing categories like highways, bridges, lighthouses, and public buildings. The bill amends the Flood Control Act of 1946 and is intended to help communities address erosion and flooding damage more effectively. This funding increase would benefit states and municipalities dealing with coastal and riverbank erosion, particularly in areas with critical infrastructure or public facilities at risk from water damage.