Watershed Index Online (WSIO): A National Watershed Data Library and Tool

Watershed Index Online has been renamed to the Restoration and Protection Screening (RPS) Indicator Database. This webpage is no longer maintained. Visit the EPA RPS website for up-to-date information and resources to support strategic planning of priority waters and watersheds.

This website provides tools and data for comparing watershed characteristics within user-selected geographic areas anywhere in the conterminous United States. The content in this site is technical and intended for scientific audiences.

The Watershed Index Online (WSIO) is a free, publicly available data library of watershed indicators and a decision-support tool, developed by EPA, to assist resource managers, citizens, and other users with evaluating, comparing, and prioritizing watersheds for a user-defined purpose. In this site users can find:

WSI Indicator Library - measurements of ecological, stressor, and social characteristics compiled for roughly 83,000 small (HUC12 scale) watersheds across the conterminous United States;
WSIO User Support - General and specific directions on how to open the WSIO Tool online, select a geographic area, choose indicators, do comparative watershed assessments, and save the analyses.