What We Do Publications, Data & Maps Maps

Maps

Browse through maps depicting Bay health and restoration, including pollution trends, public access sites and more.

  • Date created: Jan 02, 2014

    Long Term Flow-Adjusted Trends in Sediment, 1985-2012

    Long Term Trend: Forty-four percent of long-term stream monitoring sites in the Chesapeake Bay Watershed show little change in flow-adjusted concentrations of sediment. The remaining sites were evenly split between improving and degrading conditions. Between 1985 and 2012: - 8 out of 29 sites show improving flow-adjusted trends for sediment concentrations, - 8 sites show degrading trends, and - 13 sites show small changes that are not statistically significant.

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  • Date created: Jan 02, 2014

    Long-Term Trend in Flow-Adjusted Total Phosphorus Concentration, 1985-2012

    Long Term Trend: Seventy-three percent of long-term stream monitoring sites in the Chesapeake Bay Watershed show improving flow-adjusted concentrations of phosphorus. Between 1985 and 2012: - 22 out of 30 sites show improving flow-adjusted trends for phosphorus concentrations, - 4 sites show degrading trends, and - 4 sites show small changes that are not statistically significant.

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  • Date created: Jan 02, 2014

    Long-Term Trend in Flow-Adjusted Total Nitrogen Concentration, 1985-2012

    Long Term Trend: Seventy percent of long-term stream monitoring sites in the Chesapeake Bay Watershed have improving flow-adjusted concentrations of nitrogen. Between 1985 and 2012: - 21 out of 30 sites show improving flow-adjusted trends for nitrogen concentrations, - 3 sites show degrading trends, and - 6 sites show small changes that are not statistically significant.

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  • Date created: Nov 06, 2013

    Chesapeake Bay Waters Meeting WQ Goals for the Shallow Water Bay Grasses Designated Use 2010-2012

    This map demonstrates the attainment status of those Chesapeake Bay Program monitoring segments that have SAV and/or water clarity standards for the Shallow Water Bay Grasses designated use during the 2010-2012 assessment period.

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  • Date created: Nov 06, 2013

    Chesapeake Bay Waters Meeting WQ Goals for Open Water, Deep Water, and Deep Channel Uses 2010-2012

    This map demonstrates the attainment status of those Chesapeake Bay Program monitoring segments that have dissolved oxygen standards for the Open Water, Deep Water, and Deep Channel designated use during the 2010-2012 assessment period.

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  • Date created: Nov 06, 2013

    Chesapeake Bay Waters Meeting Chlorophyll a Criteria Water Quality Goals 2010-2012

    This map demonstrates the attainment status of those Chesapeake Bay Program monitoring segments that have numeric chlorophyll a standards for the Open Water designated use during the 2010-2012 assessment period.

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  • Date created: Nov 06, 2013

    Chesapeake Bay Waters Meeting WQ Goals for the Migratory, Spawning and Nursery Habitat Use 2010-2012

    This map demonstrates the attainment status of those Chesapeake Bay Program monitoring segments that have dissolved oxygen standards for the Migratory, Spawning and Nursery Habitat designated use during the 2010-2012 assessment period.

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  • Date created: Oct 24, 2013

    Shad Abundance (2012)

    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: Oct 18, 2013

    Chemical Contaminants (2012)

    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: Sep 12, 2013

    Chesapeake Bay Waters Meeting Chlorophyll a Criteria Water Quality Goals 2009-2011

    This map demonstrates the attainment status of those Chesapeake Bay Program monitoring segments that have numeric chlorophyll a standards for the Open Water designated use during the 2009-2011 assessment period.

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