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In 1984, a Biological Stream Characterization (BSC) Work Group convened to develop a multi-tiered classification of streams based primarily on fish communities. The use of letter grades "A" through "E" for evaluated reaches established a means of communicating levels of biotic integrity to diverse stakeholders. In 1992, the Illinois Natural History Survey (INHS) published a list of biologically significant streams (BSS) for the purpose of conserving biodiversity across the state. The BSS process expanded on BSC "A" rated streams by adding additional information on endangered and threatened species and mussel diversity.

The resource includes access to a stream rating report ("Integrating Multiple Taxa in a Biological Stream Rating System"), a mapping tool, and stream rating data.


A physical copy of this resource was donated to Olivet Nazarene University by the Black family. Benner Library's Digital Initiatives staff found the original content online.

J.R. Black was an advocate for the conservation of the Kankakee River and spent many years collecting data and working with multiple organizations to preserve the Kankakee River Valley.

Creative Commons License

Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.