An initiative of the Center for Environmental Journalism at the University of Colorado Boulder

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Data viz: explore our interactive dashboards for drought, precipitation and snowpack

These maps and visualizations let you interact with vital data on our water supply.

Data viz: surveying Colorado River Basin maps

This collection of Colorado River Basin maps includes public domain images and other cartographic resources for depicting the watershed.
precipitation map ecowest

Map: monthly average precipitation

This map shows total rain and snowfall in the contiguous United States, every month from 1981 to the present. The map's color scale runs from white (no precipitation), to blue (significant...
us drought monitor ecowest dashboard

Map: weekly drought reports

This map depicts data from the National Drought Mitigation Center. Drought intensity categories are based on numerous indicators and local reports from more than 350 expert observers...

Map: U.S. dams and reservoirs

The Global Dams and Reservoirs Database (GRaND) is a survey listing about 7,000 larger dams and reservoirs worldwide, including 1,920 in the United States. Data includes such...
Snowpack dashboard screenshot

Map: daily nationwide snowpack

This map shows daily snowpack estimates for the contiguous United States since October 2003. Using the dropdown menu above the chart – or clicking a state on...