Maps

The 2008 Dissolved Oxygen Indicator showing Percent of Goal Achieved using the three year analysis method.

This map shows the 2008 indicator status of the Benthic Index of Biological Integrity by station.

This map shows the percent of the Index of Biological Integrity indicator goal achieved by segment.

The map shows the average Index of Biological Integrity Score for phytoplankton by monitoring station.

The Phytoplankton (Index of Biological Integrity) map shows the percent of the goal achieved by CBP Monitoring Segment.

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

The 2007 Dissolved Oxygen Indicator showing Percent of Goal Achieved by the three year analysis method.

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.

American 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.

Sufficient dissolved oxygen (DO) is crucial for the fauna of the Chesapeake Bay to exist. Different aquatic organisms have different DO requirements. Many finfish need at least 5 mg/l while some bottom dwelling worms and clams need as little as 1 or 2 mg/l to survive. The different designated use zones (Open Water, Deep Water and Deep Channel) reflect the different needs of the species that inhabit different parts of the water column. Note: Some areas of the DO Designated Use were changed in 2007 from the original published map of 2003.