Maps
Browse through maps depicting Bay health and restoration, including pollution trends, public access sites and more.
Urban Sources of Total Nitrogen - Quartile Ranking within Pennsylvania
Date created: March 5, 2009This map shows a quartile ranking within Pennsylvania of the delivered yield (load per area) of Total Nitrogen from urban sources. Delivered yield is the amount of nutrient that is generated locally for each stream reach and weighted by the amount of in-stream loss that would occur with transport from the reach to Chesapeake Bay. The cumulative loss of nutrients from generation to delivery to the Bay is dependent on the travel time and instream-loss rate of each individual reach. This map shows estimates of Total Nitrogen based on mean conditions for the late 1990's time period using the SPARROW model from USGS. SPARROW, or SPAtially Referenced Regressions On Watershed (SPARROW) attributes, uses a nonlinear regression approach to spatially relate nutrient sources and watershed characteristics to nutrient loads of streams throughout the Chesapeake Bay watershed.
View map![](https://d18lev1ok5leia.cloudfront.net/chesapeakebay/_492xAUTO_crop_center-center_none/cbp_34537.jpg)
Urban Sources of Total Phosphorus - Quartile Ranking within Maryland
Date created: March 5, 2009This map shows a quartile ranking within Maryland of the delivered yield (load per area) of Total Phosphorus from urban sources. Delivered yield is the amount of nutrient that is generated locally for each stream reach and weighted by the amount of in-stream loss that would occur with transport from the reach to Chesapeake Bay. The cumulative loss of nutrients from generation to delivery to the Bay is dependent on the travel time and instream-loss rate of each individual reach. This map shows estimates of Total Phosphorus based on mean conditions for the late 1990's time period using the SPARROW model from USGS. SPARROW, or SPAtially Referenced Regressions On Watershed (SPARROW) attributes, uses a nonlinear regression approach to spatially relate nutrient sources and watershed characteristics to nutrient loads of streams throughout the Chesapeake Bay watershed.
View map![](https://d18lev1ok5leia.cloudfront.net/chesapeakebay/_492xAUTO_crop_center-center_none/cbp_34533.jpg)
Urban Sources of Total Phosphorus - Quartile Ranking within the Chesapeake Bay Watershed
Date created: March 5, 2009This map shows a quartile ranking within the Chesapeake Bay Watershed of the delivered yield (load per area) of Total Phosphorus from urban sources. Delivered yield is the amount of nutrient that is generated locally for each stream reach and weighted by the amount of in-stream loss that would occur with transport from the reach to Chesapeake Bay. The cumulative loss of nutrients from generation to delivery to the Bay is dependent on the travel time and instream-loss rate of each individual reach. This map shows estimates of Total Phosphorus based on mean conditions for the late 1990's time period using the SPARROW model from USGS. SPARROW, or SPAtially Referenced Regressions On Watershed (SPARROW) attributes, uses a nonlinear regression approach to spatially relate nutrient sources and watershed characteristics to nutrient loads of streams throughout the Chesapeake Bay watershed.
View map![](https://d18lev1ok5leia.cloudfront.net/chesapeakebay/_492xAUTO_crop_center-center_none/cbp_34525.jpg)
Urban Sources of Total Nitrogen - Quartile Ranking within the Chesapeake Bay Watershed
Date created: March 5, 2009This map shows a quartile ranking within the Chesapeake Bay Watershed of the delivered yield (load per area) of Total Nitrogen from urban sources. Delivered yield is the amount of nutrient that is generated locally for each stream reach and weighted by the amount of in-stream loss that would occur with transport from the reach to Chesapeake Bay. The cumulative loss of nutrients from generation to delivery to the Bay is dependent on the travel time and instream-loss rate of each individual reach. This map shows estimates of Total Nitrogen based on mean conditions for the late 1990's time period using the SPARROW model from USGS. SPARROW, or SPAtially Referenced Regressions On Watershed (SPARROW) attributes, uses a nonlinear regression approach to spatially relate nutrient sources and watershed characteristics to nutrient loads of streams throughout the Chesapeake Bay watershed.
View map![](https://d18lev1ok5leia.cloudfront.net/chesapeakebay/_492xAUTO_crop_center-center_none/cbp_34521.jpg)
Shad Abundance (2008)
Date created: March 4, 2009American 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 and Potomac 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 James Rivers represent published fishway passage values for Conowingo and Boshers Dams, respectively.
View map![](https://d18lev1ok5leia.cloudfront.net/chesapeakebay/_492xAUTO_crop_center-center_none/cbp_34908.jpg)
Dissolved Oxygen, Percent Goal Achieved for 2008, 3 YR Analysis
Date created: March 3, 2009The 2008 Dissolved Oxygen Indicator showing Percent of Goal Achieved using the three year analysis method.
View map![](https://d18lev1ok5leia.cloudfront.net/chesapeakebay/_492xAUTO_crop_center-center_none/cbp_34864.jpg)
Benthic Habitat (Index of Biological Integrity) (2008) Annual Average Score by Sampling Station
Date created: March 3, 2009This map shows the 2008 indicator status of the Benthic Index of Biological Integrity by station.
View map![](https://d18lev1ok5leia.cloudfront.net/chesapeakebay/_492xAUTO_crop_center-center_none/cbp_34876.jpg)
Benthic Habitat (Index of Biological Integrity) (2008) Percent of Goal Achieved
Date created: March 2, 2009This map shows the percent of the Index of Biological Integrity indicator goal achieved by segment.
View map![](https://d18lev1ok5leia.cloudfront.net/chesapeakebay/_492xAUTO_crop_center-center_none/cbp_34872.jpg)
Phytoplankton (Index of Biological Integrity) (2008) Annual Average Score by Sampling Station
Date created: February 27, 2009The map shows the average Index of Biological Integrity Score for phytoplankton by monitoring station.
View map![](https://d18lev1ok5leia.cloudfront.net/chesapeakebay/_492xAUTO_crop_center-center_none/cbp_34904.jpg)
Phytoplankton (Index of Biological Integrity) (2008) Percent of Goal Achieved
Date created: February 26, 2009The Phytoplankton (Index of Biological Integrity) map shows the percent of the goal achieved by CBP Monitoring Segment.
View map![](https://d18lev1ok5leia.cloudfront.net/chesapeakebay/_492xAUTO_crop_center-center_none/cbp_34900.jpg)