Eyes on the Bay - Status and Trends
Status and Trends information is calculated from data collected as part of our Chesapeake Bay Water and Habitat Quality Monitoring Program. A detailed description of our water quality status and trends methods and parameters can be found on our Status and Trends Methods page.
•Status: measure of current condition (2020-2024) at a station based on scientifically-established threshold values determined for tidal water quality based on the salinity zone; non-tidal water quality is not assessed for current condition. Based on this comparison, the station is given a ranking of "good," "fair," or "poor."
•Trend: measure of how the system has been changing over time, either improving or degrading. Trends are flow-adjusted, and represent data from 1999 to 2024.
Results for Maryland's non-tidal station trend analysis can be viewed in our MD DNR Core/Trend Results Through 2024. Earlier reports are in our publications database, and can be found using the search terms of 'report' and 'non-tidal'. Additionally, archived reports on the health of Chesapeake Bay tributaries can be found on our Tributary Water Quality and Habitat Assessments page.
| Status: | |
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Good |
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Fair |
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Poor |
| Trends: | |
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Improving |
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No Trend (no symbol on combined status & trends map) |
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Degrading |
Status is a measure of current condition (2018-2020) at a station based on scientifically-established threshold values determined for tidal water quality based on the salinity zone. Based on this comparison, each station is given a ranking of "GOOD", "FAIR", or "POOR". Trends are a measure of how the system has been changing over time, either improving or degrading. Trends shown here represent data from 1999 to 2020. Detailed Methods for Status and Trend Calculations *All metrics are annual measures, except for dissolved oxygen which is only during Summer months. |
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