The U.S. Geological Survey National Streamgage Network, 2024

In 2024, the U.S. Geological Survey operated over 12,000 streamgages to monitor surface water conditions across the country. These instruments collect river height and streamflow data—most of it updated in near real-time—to inform decisions around public safety, infrastructure, and water resource management. With data from more than 8,700 locations, the streamgage network plays a vital role in protecting both communities and ecosystems. It’s an essential system quietly working behind the scenes to help manage floods, droughts, and water supply planning.