Vermont Flood of July 2023 Data

A major rain event caused catastrophic flooding from July 9 through 12, 2023, in various portions of the State of Vermont, resulting in millions of dollars of damage. The high amount of rainfall caused several rivers to peak at record levels, in some cases exceeding records set by Tropical Storm Irene in 2011. President Biden approved an Emergency Declaration for Vermont on July 11, 2023.
The U.S. Geological Survey, in cooperation with the Federal Emergency Management Agency, collected and analyzed data that characterized the flood in Vermont, including peak water-surface elevations from high-water marks (HWMs) at bridges, dams and infrastructure sites; and peak streamflows at streamgages, lake gages, and ungaged locations. In addition, annual exceedance probability (AEP) discharge estimates from effective FEMA Flood Insurance Studies (FISs) were evaluated in the context of the July 2023 event. FIS hydraulic models were evaluated using observed streamflows and elevations along 14 rivers impacted by the July 2023 flood.
This data release is structured with three subpages containing the datasets in Excel or Comma Separated Values format. The datasets include high-water mark elevations, peak streamflow, peak stage, and annual exceedance probability data of the July 9 through 12, 2023 flood in Vermont as well as comparison data of the flood event to FEMA Flood Insurance Studies in selected locations.