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Chemical Contaminants (2020)

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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Congressional Districts in the Chesapeake Bay Watershed (118th Congress)

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 118th Congress who have districts within the borders of the basin are listed by state.

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Chemical Contaminants (2018)

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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Chesapeake Bay Mean Surface Salinity (1985-2018)

The salinity of the waters in the Chesapeake Bay and its tidal tributaries varies from season to season and year to year depending largely on the amount of freshwater flowing into the Bay. The salinity of these tidal waters has an effect on such things as fish spawning habitat, underwater grass species distribution, oyster distribution and the likely distribution of the oyster-killing parasites Dermo and MSX.

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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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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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