Maps

This map shows the percent passing of the Water Clarity goals for each Chesapeake Bay Segment in 2007.

Tidal waters that are impaired for part or all of indicated Bay segment by toxic chemicals based on each state's implementation of the Clean Water Act.

Over the past decade, sightings of the zebra mussel, have increased in the Chesapeake Bay watershed. Zebra mussels can out-compete native species for space, food and nutrients. They also clog water intakes and damage equipment by attaching to boat motors and hard surfaces. Zebra mussels spread by attaching to watercraft, aquatic plants, nets, fishing equipment, or through water currents as larvae. For this reason, public awareness, education and warning are crucial elements in the fight against zebra mussel invasion. This map lists zebra mussel sightings in the Chesapeake Bay Watershed through 2010.

Population projections were produced by the Population Division of the U.S. Census Bureau. The projections were produced for the years 2001 to 2030, based on Census 2000 results, and the general assumption that recent state-specific trends in fertility, mortality, domestic migration, and international migration will continue.

This map shows the Delivered yield (load per area) of Total Phosphorus from point 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 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 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 Delivered yield (load per area) of Total Phosphorus from agricultural 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 population estimates within the Chesapeake Bay watershed on a county-by-county basis for the year 2005. The Census Bureau publishes July 1 estimates for years after the last decennial census (2000), as well as for past decades. Data series for births, deaths, and domestic and international migration are used to update the decennial census base counts.

This map shows the Delivered yield (load per area) of Total Phosphorus from all 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 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.