Maps

Long-term trends were computed by state partners using the Seasonal Kendall non-parametric technique for annual data collected from 1999-2013. Highly significant trends are indicated with triangles and possible trends are show with colored circles. Secchi Disk Depth observations (a measure of water clarity) are increasing/improving significantly at 2 stations, possibly increasing at 2 stations, decreasing/degrading significantly at 28 stations, and possibly decreasing at 14 stations.

This map shows the percent of the Water Clarity goal achieved for each Chesapeake Bay Segment in 2011.

This map shows the percent of the Water Clarity goal achieved for each Chesapeake Bay Segment in 2010.

This map shows the percent of the Water Clarity goal achieved for each Chesapeake Bay Segment in 2009.

This map shows the percent of the Water Clarity goal achieved for each Chesapeake Bay Segment in 2008.

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.

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