The Mid-Atlantic Tributary Assessment Coalition is a unique and growing group of watershed organizations interested in advancing the use of environmental data from local organizations and citizen scientists for use in report cards and assessments. Using data collected by concerned citizens, IAN has helped to generate multi-year report cards for nine rivers since 2007.

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This report card provides grades for the three tidal regions of the Patuxent River estuary, located on the Western Shore of Chesapeake Bay. The grades are based on six ecological indicators: dissolved oxygen, water clarity, chlorophyll a, phytoplankton community, benthic community, and aquatic grasses.

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