Hydrology for the Nation, From the Sky Down to the Aquifer

Understanding the water cycle requires a comprehensive insight into hydrology that nobody else can offer. We provide you with crucial tools for water supply management, outdoor recreation, conservation planning, and so much more.



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The USGS maintains a hierarchical system of hydrologic units broken up into regions, sub-regions, accounting units, and cataloging units.


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Our algorithms analyze multiple environmental factors and provide tuned predictions for snow on the mountain, as well as future discharge on the river. With hourly weather forecasts and instantaneous realtime reporting, Snoflo is your source for the latest news on the mountain or river.


  • FREE
  • Basic Access
  • Advanced Mapping & Layers
  • Advanced Gauge Analysis and Forecasting
  • Watershed & River Statistics
  • Favorites Analysis and Visualizations
  • Unlimited Alerts for Snowpack and Streamflow
  • Snowpack and Streamgauge Data
  • Avalanche Data
  • Groundwater Data
  • Reservoir Levels
  • River Data
  • Watershed Data
  • Ski Reports
  • River Run Reports
  • Fishing Area Reports

View the Heatmap!

Snoflo provides interactive heatmaps that let you understand hydrology in a whole new way.

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