Data Sources
The official agencies whose published measurements power this site.
- U.S. Geological Survey (USGS) Water Data — continuous lake and reservoir elevation and storage from USGS-operated gauges. waterdata.usgs.gov
- Bureau of Reclamation RISE — reservoir elevation and storage for Reclamation projects such as Lake Mead, Lake Powell and Shasta Lake. data.usbr.gov
- LCRA Hydromet — current levels and percent full for the Highland Lakes on the Colorado River of Texas. Data courtesy of the Lower Colorado River Authority and subject to revision. hydromet.lcra.org
- U.S. Army Corps of Engineers CWMS — reservoir data for Corps-operated projects. water.usace.army.mil
Each lake page links to the exact series it uses. Agencies revise data after review; the official source is always authoritative.
Last updated November 3, 2026