Maps

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.

The 92-segment scheme for the Chesapeake Bay and its tidal tributaries used for dissolved oxygen and water clarity assessments in the most recent 303d/305b listing efforts of the four Bay tidal jurisdictions is documented here. The 92-segment scheme was derived from 1) the 2003 published 78-segment scheme with the addition of jurisdictional boundary lines imposed to create 89-segments, then 2) additionally includes only split segments agreed upon for the tidal James and Potomac rivers.

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

This map shows the Phase 4.3 Watershed Model Segmentation. The current Model Segmentation (as of July 2011) is Phase 5.3.

This map shows the historic Phase 3.0 Watershed Model Segmentation. The current version (as of July 2011) is Phase 5.3.

This map shows the historic Phase 2.0 Watershed Model Segmentation. The current version (as of July 2011) is Phase 5.3.

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.