Bathymetric Data for U.S. Waters and Navigational Lakes

BlueTopo is a definitive nationwide model of seafloor and lakebed depths for navigationally significant U.S. waters, compiled by NOAA's Office of Coast Survey. It integrates bathymetric data from NOAA and U.S. Army Corps of Engineers surveys, lidar, and external submissions, with gaps filled using the Global Multi-Resolution Topography model. The dataset includes metadata with quality metrics to guide appropriate use.

Use Cases

• Analyze bathymetric data to model seafloor topography and identify underwater hazards for nautical charting.
• Use the included quality metrics metadata to assess source data reliability for hydrographic research and coastal management.
• Integrate compiled bathymetry with other geospatial datasets for marine spatial planning and habitat mapping in U.S. waters.
• Study depth variations in navigational lakes using the definitive nationwide model to support inland waterway navigation and engineering.

Strengths

• Compilation of the nation's best available bathymetric data from authoritative sources like NOAA and the U.S. Army Corps of Engineers.
• Includes metadata with quality metrics from source data, enabling users to evaluate data fitness for specific applications.
• Provides nationwide coverage for navigationally significant U.S. waters, including seafloor and lakebed depths.

Limitations

• Specific technical details like row count, column structure, and file sizes are not provided in the input.
• Primary file formats listed are PDF and HTML, which may not be immediately suitable for direct computational analysis without conversion.
• Coverage for waters over 200 meters deep relies on a global merged model, which may have lower resolution than direct survey data.

Provenance

Source

National Oceanic and Atmospheric Administration, Department of Commerce.

Collection Method

Curated compilation from NOAA and U.S. Army Corps of Engineers hydrographic surveys, topo-bathy lidar, and external data submissions.

Freshness

Last updated on 2026-03-10.

Geography

Navigationally significant U.S. waters, including seafloor and navigational lakes.