Great Lakes Mapping Act of 2025

The Great Lakes Mapping Act of 2025 requires the National Oceanic and Atmospheric Administration (NOAA) to create high-resolution maps of all Great Lakes lakebeds by December 31, 2030. This includes collecting detailed depth measurements, cataloging existing data, and managing metadata, with NOAA coordinating with Great Lakes states, regional councils, and existing initiatives. The bill mandates that partial maps be shared publicly during the project and the full map with supporting data must be released within 180 days of completion. It authorizes $50 million annually (2025-2029) for this effort, with funds available through 2030. The law directly affects NOAA and its partners, enabling improved resource management and navigation through publicly accessible lakebed data.