Maps

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.

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.

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.

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.

This map shows a quartile ranking within Maryland 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.

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.

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.

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.

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.

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.