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Date created: Jan 07, 2015
Short-Term Trend in Flow-Adjusted Total Phosphorus Concentration, 2004-2013
Over the past decade, none of the monitoring sites in the Chesapeake Bay watershed have shown improving flow-adjusted trends in phosphorus concentrations. Between 2004 and 2013: zero sites have shown improving trends for phosphorus concentrations. Two sites—including the Choptank and Susquehanna rivers—have shown degrading trends. Seven sites—including the Appomattox, James, Mattaponi, Pamunkey, Patuxent, Potomac and Rappahannock rivers—have shown minor changes that are not statistically significant.
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Date created: Jan 07, 2015
Long-Term Trend in Flow-Adjusted Total Phosphorus Concentration, 1985-2013
One-third of the monitoring sites in the Chesapeake Bay watershed show improving long-term flow-adjusted trends in phosphorus concentrations. Between 1985 and 2013: three out of nine sites—including the James, Patuxent and Potomac rivers—have shown improving trends for phosphorus concentrations. Three sites— including the Appomattox, Choptank and Pamunkey rivers—have shown degrading trends. Three sites—including the Mattaponi, Rappahannock and Susquehanna rivers—have shown minor changes that are not statistically significant.
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Date created: Jan 07, 2015
Short-Term Trend in Flow-Adjusted Total Nitrogen Concentration, 2004-2013
Over the past decade, one-third of the monitoring sites in the Chesapeake Bay watershed have shown improving flow-adjusted trends in nitrogen concentrations. Between 2004 and 2013: three out of nine sites—including the Patuxent, Potomac and Susquehanna rivers—have shown improving trends for nitrogen concentrations. One site—the Choptank River—has shown degrading trends. Five sites—including the Appomattox, James, Mattaponi, Rappahannock and Pamunkey rivers—have shown minor changes that are not statistically significant.
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Date created: Jan 07, 2015
Long-Term Trend in Flow-Adjusted Total Nitrogen Concentration, 1985-2013
Fifty-five percent of monitoring sites in the Chesapeake Bay watershed show improving long-term flow-adjusted trends in nitrogen concentrations. Between 1985 and 2013: five out of nine sites—including the James, Patuxent, Potomac, Rappahannock and Susquehanna rivers—have shown improving trends for nitrogen concentrations. Two sites—including the Choptank and Pamunkey rivers—have shown degrading trends. Two sites—including the Appomattox and Mattaponi rivers—have shown minor changes that are not statistically significant.
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Date created: Sep 18, 2014
Protected Lands 2013
This map represents a complete, aggregated layer of protected lands in the Chesapeake Bay watershed and intersecting counties as of 2013. It is a combination of multiple state, federal and non-governmental organization sources. Overlapping and duplicate areas have been deleted to address double counting.
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Date created: Jun 19, 2014
Federal Lands and Facilities in the Chesapeake Bay Watershed
This map was compiled by Chesapeake Bay Program staff to assist in the identification of Federally owned properties and facilities in the Chesapeake Bay Watershed.
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Date created: Jun 09, 2014
2013 Public Access
Existing public access sites in the Chesapeake Bay watershed as reported by state partners through 2013. Sites added in 2013 are depicted in orange, while sites existing before 2013 are blue.
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Date created: Apr 21, 2014
SAV Salinity Zones
Up until 2013, submerged aquatic vegetation (SAV, also known as bay grasses) acreage totals for the Chesapeake Bay were aggregated into three zones: Upper Bay, Middle Bay and Lower Bay. For 2013, it was decided to report the totals by the four salinity zones found in the Bay: tidal fresh, oligohaline, mesohaline and polyhaline. Since different species of SAV are generally found in waters of a specific range of salinity, tracking changes in SAV abundance by salinity could help track changes in species abundance more easily.
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Date created: Apr 14, 2014
Riparian Forest Buffer Restoration (2013)
This map shows the locations of riparian forest buffer restoration projects throughout the Chesapeake Bay Watershed. Project locations were provided by Forestry Workgroup representatives from the Maryland Department of Natural Resources, the Virginia Department of Forestry, the Pennsylvania Department of Conservation and Natural Resources, the West Virginia Division of Forestry, the Delaware Department of Natural Resources and Environmental Control and the Upper Susquehanna Coalition.
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Date created: Apr 03, 2014
Bay Grasses (SAV) Restoration Goal Achievement: Single Best Year 2011-2013
This map shows progress toward achieving the Chesapeake Bay Program segment-specific underwater bay grass restoration goals. It is based on the single best year of acreage as observed through the most recent three years of data from the Chesapeake Bay underwater bay grasses aerial survey.
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