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Date created: Nov 08, 2017
Chemical Contaminants (2014)
Tidal waters that are impaired for part or all of the indicated Bay segment by toxic chemicals based on each state's implementation of the Clean Water Act.
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Date created: Jan 03, 2017
Congressional Districts in the Chesapeake Bay Watershed
This map shows the complete or partial Congressional Districts that make up the area of the Chesapeake Bay basin. The current senators and congressional members of the 115th Congress who have districts within the borders of the basin are listed by state.
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Date created: May 16, 2016
Shad Abundance (2015)
American shad were once the most abundant and economically important species in the Chesapeake Bay. Shad are anadromous fish and spend most of their lives in the ocean, returning to freshwater rivers to spawn after they reach maturity. Data for the York, Potomac, Rappahannock and lower James Rivers were provided by the Virginia Institute of Marine Science via an ongoing Catch per Unit Effort (CPUE) study involving American Shad gill-netting. Data for the Susquehanna and upper James Rivers represent published fishway passage values for Conowingo and Boshers Dams, respectively.
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Date created: Jul 02, 2015
Benthic Habitat (Index of Biological Integrity) (2014) Annual Average Score by Sampling Station
This map shows the 2014 indicator status of the Benthic Index of Biological Integrity by station.
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Date created: Jul 02, 2015
Benthic Habitat (Index of Biological Integrity) (2013) Annual Average Score by Sampling Station
This map shows the 2013 indicator status of the Benthic Index of Biological Integrity by station.
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Date created: Jul 02, 2015
Benthic Habitat (Index of Biological Integrity) (2014) Percent of Goal Achieved
This map shows the percent of the Index of Biological Integrity indicator goal achieved by segment.
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Date created: Jul 02, 2015
Benthic Habitat (Index of Biological Integrity) (2013) Percent of Goal Achieved
This map shows the percent of the Index of Biological Integrity indicator goal achieved by segment.
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Date created: Apr 30, 2015
Long-Term Trends for Secchi Disc Depth in the Chesapeake Bay: 1999-2013
Long-term trends were computed by state partners using the Seasonal Kendall non-parametric technique for annual data collected from 1999-2013. Highly significant trends are indicated with triangles and possible trends are show with colored circles. Secchi Disk Depth observations (a measure of water clarity) are increasing/improving significantly at 2 stations, possibly increasing at 2 stations, decreasing/degrading significantly at 28 stations, and possibly decreasing at 14 stations.
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Date created: Apr 30, 2015
Long-Term Trends for Bottom Orthophosphate in the Chesapeake Bay: 1999-2013
Long-term trends were computed by state partners using the Seasonal Kendall non-parametric technique for annual data collected from 1999-2013. Highly significant trends are indicated with triangles and possible trends are show with colored circles. Bottom Orthophosphate concentrations are decreasing/improving significantly at 21 stations, possibly decreasing at 7 stations, increasing/degrading significantly at 6 stations, and possibly increasing at 3 stations.
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Date created: Apr 30, 2015
Long-Term Trends for Bottom Total Phosphorus in the Chesapeake Bay: 1999-2013
Long-term trends were computed by state partners using the Seasonal Kendall non-parametric technique for annual data collected from 1999-2013. Highly significant trends are indicated with triangles and possible trends are show with colored circles. Bottom total phosphorus concentrations are decreasing/improving significantly at 27 stations, possibly decreasing at 13 stations, increasing/degrading significantly at 12 stations, and possibly increasing at 10 stations.
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