Maps
Browse through maps depicting Bay health and restoration, including pollution trends, public access sites and more.
2013 Public Access
Date created: June 9, 2014Existing 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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SAV Salinity Zones
Date created: April 21, 2014Up 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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Riparian Forest Buffer Restoration (2013)
Date created: April 14, 2014This 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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Bay Grasses (SAV) Restoration Goal Achievement: Single Best Year 2011-2013
Date created: April 3, 2014This 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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Fish Passage Progress (2013) in the Chesapeake Bay Watershed
Date created: March 27, 2014Fish passage is a key component to the restoration of anadromous fish (shad and river herring) in the Chesapeake Bay watershed. These fish are blocked from much of their historic spawning areas, which included waters over 200 miles from the Bay. Maryland, Virginia, Pennsylvania and the District of Columbia have set goals to provide fish passage to make much of those historic spawning areas once again accessible to migratory fish. Other species that benefit from the unblocking of streams include eels, native species such as brook trout and other resident species.
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Shad Abundance (2013)
Date created: March 24, 2014American 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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Sediment Yields Measured in Watershed Streams and Rivers, Mean 2008-2012
Date created: January 2, 2014Watershed Yield: Sediment yields ranged from 9.3 to 648 tons per square mile. Each of the 17 sites in the high yield category carries more than 200 tons of sediment per square mile of watershed. High yielding sites are spatially dispersed across the Susquehanna, Potomac and Rappahannock watersheds. The lowest sediment yielding sits are located on the Eastern Shore and the York River Basin.
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Total Phosphorus Yields Measured in Watershed Streams and Rivers, Mean 2008-2012
Date created: January 2, 2014Watershed Yield: Total Phosphorus yields ranged from 0.036 to 0.57 tons per square mile. Each of the 17 sites in the high yield category carries more than 0.19 tons of phosphorus per square mile of watershed. High yielding sites were found in the Eastern Shore, Susquehanna, Potomac, and Rappahannock Watersheds. The lowest yields are generally in the western areas of the Bay watershed and the York River Basin.
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Total Nitrogen Yields Measured in Watershed Streams and Rivers, Mean 2008-2012
Date created: January 2, 2014Watershed Yield: Total Nitrogen yields ranged from 0.33 to 9.87 tons per square mile. Each of the 17 sites in the high yield category carries more than 3.4 tons of nitrogen per square mile of watershed. These sites are generally located on the Eastern Shore, Lower Susquehanna and Northern Potomac Watersheds. The lowest yields, which are less than 1.2 tons per square mile, are generally in the Upper Potomac and Southern Virginia Rivers.
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Short Term Flow-Adjusted Trends in Sediment, 2003-2012
Date created: January 2, 2014Short Term Trend: Over the past 10 years, 49 percent of sites show little change while 41 percent show degrading flow-adjusted sediment concentrations. Between 2003 and 2012: - 4 out of 39 sites show improving flow-adjusted trends for sediment concentrations, - 16 site shows degrading trends, and - 19 sites show small changes that are not statistically significant.
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