Skip to main content
U.S. flag

An official website of the United States government

CO-OPS Air Gap Observations from Various Bridges within the United States and Its Territories

Published by NOAA National Centers for Environmental Information | National Oceanic and Atmospheric Administration, Department of Commerce | Catalog Last Checked: August 01, 2026 at 09:06 AM | Dataset Last Updated: February 24, 2020 at 12:00 AM
The Center for Operational Oceanographic Products and Services (CO-OPS) of the National Ocean Service (NOS), an organizational element of NOAA, operates and maintains a network of downward-looking microwave range sensors for determining the instantaneous clearance or air gap below bridges that span navigable waterways in the US. These observations are part of the National Physical Oceanographic Real-Time System (PORTS) Program. The data collected are used to ensure safety of navigation, improve economic efficiency, and protect coastal resources. Included in this data collection are preliminary 6-minute air gap observations from about 18 bridges spanning navigable waterways in the US.

Resources

6 resources available

  • Metadata Landing Page

    TEXT/HTML
  • NCEI Customer Service

    TEXT/HTML
  • Physical Oceanographic Real-Time System (PORTS)

    TEXT/HTML
  • CO-OPS Sensor Specifications and Measurement Algorithms

    PDF
  • Global Change Master Directory (GCMD) Keywords

    TEXT/HTML
  • WMO Codelist Catalog for ISO 19139 Metadata

    XML

Find Related Datasets

Search by Tags

Click any tag below to search for similar datasets

Explore Collection

Navigate datasets in this collection

Find Related Datasets
Includes 1 related dataset

data.gov

An official website of the GSA's Technology Transformation Services

Looking for U.S. government information and services?
Visit USA.gov