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Browse History: York River (2011)

Chesapeake Bay - Reporting Region Summary:



  Estuary Selection Map

Scores & Conceptual Diagram


Bay Health Index
Benthic Index of Biotic Integrity Icon
28%
D
York River: 2011

Poor ecosystem health. While there were decreases in the water clarity, aquatic grasses, and benthic community scores, these changes were minor and the grade remained the same as 2010.
  • Water quality: Water clarity has been consistently very poor in this region over the past 20+ years. Dissolved oxygen tends to vary between years, but has scored in the moderate to moderately good range for the last ten years. In 2011, the dissolved oxygen score slightly declined (67%). Chlorophyll a scores increased by 6% from 2010, remaining in poor condition (30%).
  • Biotic indicators: Aquatic grasses scores decreased after improving for three years in a row, and are now in very poor condition (19%). Phytoplankton community scores slightly increased in 2011 (15%), but are still in very poor condition. Although the benthic community score declined (32%), this indicator is still in better condition (poor) than aquatic grasses and phytoplankton community. 

Score Legend
Locator Map
  Index/Indicator Score     Index/Indicator Score
Benthic Index of Biotic Integrity Icon Chlorophyll a
30%
  Benthic Index of Biotic Integrity Icon Aquatic grasses
19%
Benthic Index of Biotic Integrity Icon Dissolved oxygen
67%
  Benthic Index of Biotic Integrity Icon Benthic Index of Biotic Integrity
32%
Benthic Index of Biotic Integrity Icon Water clarity
4%
  Benthic Index of Biotic Integrity Icon Phytoplankton Index of Biotic Integrity
15%
 
Benthic Index of Biotic Integrity Icon Water Quality Index
34%
  Biotic Index Icon Biotic Index
22%
 

Excel Spreadsheet

Dynamic Conceptual Diagram

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Region Info

The York River watershed drains approximately 2,600 square miles of land. The York River watershed includes all of the area flowing into the Pamunkey and Mattaponi Rivers and their many tributaries. The Pamunkey and Mattaponi rivers begin in the Blue Ridge Mountains and meander through the Piedmont. Major cities in the watershed include Ashland, Gloucester Point, Hampton, and West Point. The census population for 2000 in the watershed was 372,488. Based on information in Dauer, et al., 2005 and The York River and Small Coastal Basins Roundtable.

york_riverconceptual diagram.png

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