Hydrologic Outlooks

Long-term hydrologic projections across multiple variables, scenarios, and models for the contintental United States, Alaska and parts of Western Canada.

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Content available on this site

• Modeled streamflow projections for stream segments and HUC-8 watersheds across the continental United States, based on PRMS (the Precipitation Runoff Modeling System, USGS)
• Streamflow and water temperature projections for Alaska and parts of Western Canada, based on RASM (the Regional Arctic System Model)
• Peak flow, low flow, seasonal averages, and other key hydrologic statistics, including range and uncertainty across climate models, emissions scenarios, and eras
• Interactive maps for finding stream segments, with charts and tables summarizing projected change for each segment
• CSV downloads and API access for full site-specific datasets

The site also includes a how-to guide, a discussion of models and uncertainty, and full descriptions of the available data.