National Dam Safety Program Reauthorization Act of 2023

This bill reauthorizes the National Dam Safety Program through 2028, extending funding and updating requirements for dam safety. It defines "small disadvantaged community" (under 50,000 population with income below 80% of state median) and ensures these communities receive priority for dam rehabilitation grants. Key provisions require dam owners to commit to long-term maintenance plans and mandate floodplain management plans - either already in place or developed within two years - to reduce flood risks and protect communities. The bill also establishes a risk-based priority system for states to allocate grants for high-hazard dams.