Visualizing U.S. Army Corps of Engineers Reservoir Data

Disclaimer: The data used in this tool have not been reviewed by the U.S. Army Corps of Engineers. The tool should be used for academic purposes only as it is continually being improved. The tool is best viewed in Chrome, Firefox, Microsoft Edge, and Safari browsers. It does not work with Internet Explorer.

How to Use This Tool

The map shows the location of U.S. Army Corps of Engineers reservoirs and their associated water levels through time. The original analysis, map legends, and paper used provisional, unreviewed data obtained from Corps districts up to September 30, 2015. You may change the dates below the plots to match the orginal analysis. Elevation and storage volumes have been added when available through May 2020 from the Corps webportal with minimal cleaning. No adjustments have been made for changes to operational targets or relationships between elevation and storage volumes.

Use the grey sidebar on the left to change the legend and filter reservoirs displayed on the map. Click on any reservoir in the map to see analysis results for that reservoir in the tabbed panels below. Change the time period for the analysis by typing in a year and clicking the submit (option located below the tabbed panels). Short descriptions of each analysis are provided within the tab.

Operational targets (also known as rule curves or guide curves) are the management goals for reservoir levels throughout a year as described in publicly discoverable and accessible water control plans. Further details are contained in the Nicholas Institute for Environmental Policy Solutions report, Creating Data as a Service for U.S. Army Corps of Engineers Reservoirs.

Select Legend:

Filter Reservoirs:



Year Constructed:

Operating Purpose:
Flood Control
Water Supply & Irrigation
Fish & Wildlife, Water Quality, Conservation, or Low Flow
Sediment Control, Brine, or Debris Control

Over Under displays the lake elevation relative to the operational target. Click here for more information:

Over Under Plot

Systematic Departures display summary statistics of storage volume relative to operational targets throughout the year. Click here for more information:


Storage Volume

Storage duration curves displays the frequency of storage volume relative to operational targets over time. Click here for more information:

Reservoir SDC

District SDC

Operational departures over time displays the cumulative sum of departures from the operational target over time. The palmer drought severity index for the climate division of the reservoir is overlayed. Click here for more information:

Operational Departure over Time

Drought Index Legend

District Summary

The matrix combines magnitude of departure with the frequency of departure. The operational target was used for the web version of the analysis and does not include operational target bands or min/max drawdowns for reservoirs with variable operational targets (predominantly the Northwest Division). Click here for more information:

The Matrix

Matrix Results

District Results

Disclaimer: Data are available for download in CSV format. The data used in this tool are provisional and have not been vetted by the U.S. Army Corps of Engineers. Data records do not extend beyond September 30, 2015. The U.S. Army Corps of Engineers will release the authoritative data in the future. Please contact us if an error is located in the data so this tool can be continually improved.This work was funded by an IPA from the U.S. Army Corps of Engineers Institute for Water Resources.