Watershed Health Scores

Watershed Health Scores are calculated to show patterns of health within each of the five components for the state of Minnesota.  Using a consistent scale of 0 (least healthy/red) to 100 (best health/green), the health scores compare and contrast ecologically significance relationships across the state. 

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Explore details about the science behind each index:  


Terrestrial Habitat Quality

Stream Species Quality

Animal Species Richness

At Risk Animal Spcs. Richness

Combined Biology


Terrestrial Habitat Connectivity

Aquatic Connectivity

Riparian Connectivity

Combined Connectivity


Soil Erosion Susceptibility

Pollution Sensitivity of Near-Surface Materials

Climate Water Balance

Steep Slopes Near Streams

Combined Geomorphology


Perennial Cover

Impervious Cover

Water Withdrawal

Hydrologic Storage

Flow Variability

Combined Hydrology

Water Quality

Non-point Source

Localized Pollution Source


Combined Water Quality

Component scores are combined into an overall Watershed Health Score:

Combined Watershed Health Score

Mean Watershed Score

Download Health Score Data

Watershed Health Assessment Scores

Download the WHAF Health Scores as GIS Data (Minnesota Geospatial Commons)

Additional resources

Health Index Score Summary Table 

Download table summarizing all health scores and data sources.

Watershed Health Reports

Download health reports for Minnesota's 81 major watersheds.

Building a Watershed Health Index

Review the approach taken for developing watershed health index scores.