Category: Pressures
Bay Pressure maps from our Bay Program map gallery. Prior to using any of these maps, please view our terms of use to learn about usage rights.
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Date created: Apr 27, 2015
Population (2014)
This map shows population estimates within the Chesapeake Bay watershed on a county-by-county basis for the year 2014. For counties not completely within the Chesapeake Bay watershed, the population numbers were derived as a proportion of the total county based on land area.
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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: Jul 08, 2013
Dissolved Oxygen, Percent Goal Achieved for 2012, 3 YR Analysis
The 2012 Dissolved Oxygen Indicator showing Percent of Goal Achieved using the three year analysis method.
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Date created: Jan 02, 2013
Chesapeake Bay watershed 5 year short-term sediment yields 2007 - 2011
Average yields for total sediment (TS) were estimated for the last five years at 65 sites and classified into thirds as high, medium, and low. While the distribution was spatially variable, there were some general patterns in location. Generally, spatial patterns not very discernible for sediment except for higher yields in the middle of the watershed, areas where total nitrogen and total phosphorus yields are also highest. The lowest yields are generally in the western areas of the Bay watershed, an area dominated by forests and on the Eastern Shore of Maryland and Delaware.
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Date created: Jan 02, 2013
Chesapeake Bay watershed 5 year short-term phosphorus yields 2007 - 2011
Average yields for total phosphorus (TP) were estimated for the last five years at 65 sites and classified into thirds as high, medium, and low. While the distribution was spatially variable, there were some general patterns in location. Generally, higher yields for TP are dominant in the middle of the watershed, areas that also coincide with large urban and agricultural land uses. The lowest yields are generally in the western areas of the Bay watershed, an area dominated by forests.
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Date created: Jan 02, 2013
Chesapeake Bay watershed 5 year short-term nitrogen yields 2007 - 2011
Average yields for total nitrogen (TN) were estimated for the last five years at 65 sites and classified into thirds as high, medium, and low. While the distribution was spatially variable, there were some general patterns in location. Generally, higher yields for TN are dominant in the middle of the watershed, areas that also coincide with large urban and agricultural land uses. The lowest yields are generally in the Virginia watersheds.
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Date created: Jan 02, 2013
Chesapeake Bay watershed 10 year sediment flow-adjusted concentration trend 2002 - 2011
Over the past 10 years, the majority of sediment concentration trends are non-significant monitoring at sites within the Bay watershed with many sites showing degrading condition and only a few are improving. The trend results indicate that at some monitored locations, short-term trends indicate that management actions, such as efforts to curb erosion and runoff have reduced concentrations of sediment. While these reductions provide evidence of improving conditions in some upstream areas, additional reductions will be needed to have healthier streams and meet water-quality goals for the Bay.
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Date created: Jan 02, 2013
Chesapeake Bay watershed 10 year phosphorus flow-adjusted concentration trend 2002 - 2011
Over the past 10 years, the majority of phosphorus concentration trends are non-significant monitoring at sites within the Bay watershed with many sites showing improving condition and only a few are degrading. The trend results indicate that in many locations, management actions, such as improved wastewater treatment and nonpoint-source pollution controls (i.e. urban stormwater runoff and agricultural runoff controls), have reduced phosphorus concentrations in streams.
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Date created: Jan 02, 2013
Chesapeake Bay watershed 10 year nitrogen flow-adjusted concentration trend 2002 - 2011
Over the past 10 years, the majority of nitrogen concentration trends are non-significant (28 sites), with 19 sites showing improving condition and only 1 site showing degrading conditions. The trend results indicate that in many locations, management actions, such as improved wastewater treatment and nonpoint-source pollution controls (i.e. urban stormwater runoff and agricultural runoff controls), have reduced nitrogen concentrations in streams.
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Date created: Jan 02, 2013
Chesapeake Bay watershed suspended sediment long-term flow-adjusted concentration trends 1985-2011
Changes in suspended sediment concentrations have been determined for the period 1985-2011 at 31 stream sites in the Chesapeake Bay watershed. Of these, 14 sites show trends that were not statistically significant, 9 sites show improving trends, and 8 sites show degrading trends.
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