Maps
Browse through maps depicting Bay health and restoration, including pollution trends, public access sites and more.
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: Jun 13, 2012
Nitrogen Yields and Short-Term Trends Measured in Watershed Streams and Rivers
Over the past 10 years, nitrogen concentration trends are downward at about half (16 out of 33) monitoring sites within the Bay watershed. 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. In addition, in the last 5 years, higher yields indicate a tendency to be located in the northern half of the watershed, conversely. lower yields are more numerous in the lower half of the watershed. The short-term flow-adjusted trends and yields indicator is calculated, and results and maps are published annually by the U.S. Geological Survey as part of a larger effort to determine loads and trends in nutrient and sediment concentrations and streamflow in the Chesapeake Bay watershed.
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Date created: May 10, 2012
Chlorophyll a (2011) Percent Goal Achieved
The 2011 Chlorophyll a percent of goal achievement by CBP segment.
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Date created: May 10, 2012
Mid-Channel Water Clarity (2011)
This map shows the percent of the Water Clarity goal achieved for each Chesapeake Bay Segment in 2011.
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Date created: May 10, 2012
Dissolved Oxygen, Percent Goal Achieved for 2011, 3 YR Analysis
The 2011 Dissolved Oxygen Indicator showing Percent of Goal Achieved using the three year analysis method.
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Date created: Aug 05, 2011
Population (2010)
This map shows population estimates within the Chesapeake Bay watershed on a county-by-county basis for the year 2010. These are actual Census Bureau population figures provided after the last decennial census (2010). However, 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: Aug 03, 2011
Chesapeake Bay Segmentsheds with Major Basins
This map displays the segmentsheds used by the Chesapeake Bay Program. A segmentshed is the discrete land area that drains into each of the 92 Bay Program segments (see map of Chesapeake Bay Segmentation Scheme) that have TMDLs associated with them.
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Date created: Aug 03, 2011
Chesapeake Bay Segmentsheds with Counties
This map displays the segmentsheds used by the Chesapeake Bay Program. A segmentshed is the discrete land area that drains into each of the 92 Bay Program segments (see map of Chesapeake Bay Segmentation Scheme) that have TMDLs associated with them.
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Date created: Aug 03, 2011
Chesapeake Bay Segmentsheds
This map displays the segmentsheds used by the Chesapeake Bay Program. A segmentshed is the discrete land area that drains into each of the 92 Bay Program segments (see map of Chesapeake Bay Segmentation Scheme) that have TMDLs associated with them.
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Date created: Jul 15, 2011
Point Sources and Priority Agricultural Watersheds - Delaware
This map shows the location of point sources of nutrient pollution and priority agricultural watersheds as identified by the Chesapeake Bay Program with input from the Natural Resources Conservation Service (NRCS). Point sources include both monitored and estimated data submitted from or approved by each jurisdiction. Priority agricultural watersheds include SPARROW catchments ranking in the top quartile for delivered loads of nitrogen or phosphorus from agricultural sources normalized by the total amount of agricultural areas within the catchment. The priority areas were further refined to emphasize high loading areas which also contained potential agriculture-related water quality impairments based on individual state 303d (impaired waters) lists.
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Date created: Jul 15, 2011
Point Sources and Priority Agricultural Watersheds - West Virginia
This map shows the location of point sources of nutrient pollution and priority agricultural watersheds as identified by the Chesapeake Bay Program with input from the Natural Resources Conservation Service (NRCS). Point sources include both monitored and estimated data submitted from or approved by each jurisdiction. Priority agricultural watersheds include SPARROW catchments ranking in the top quartile for delivered loads of nitrogen or phosphorus from agricultural sources normalized by the total amount of agricultural areas within the catchment. The priority areas were further refined to emphasize high loading areas which also contained potential agriculture-related water quality impairments based on individual state 303d (impaired waters) lists.
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