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Browse History: Elizabeth River (2011)

Chesapeake Bay - Reporting Region Summary:



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Scores & Conceptual Diagram


Bay Health Index
Benthic Index of Biotic Integrity Icon
14%
F
Elizabeth River: 2011

Very poor ecosystem health—lowest ranked region in the Bay. This is the first year where this region has received a grade. Three of the indicators, water clarity, phytoplankton community, and benthic community, each scored a 0%.

  • Water quality: Water clarity was very poor, scoring a 0% in 2011, which is consistent with the majority of water clarity scores over the last 20+ years. Chlorophyll a (18%) decreased slightly from 2010 (27%). Dissolved oxygen increased in 2011 (64%) compared to 2010 (50%).
  • Biotic indicators: The phytoplankton community condition score in 2011 was 0% for the fifth year in a row, meaning none of the samples collected passed the threshold level. Benthic community was measured for the first time this year, but scored a 0%. Aquatic grasses are not measured in the Elizabeth River because they do not naturally occur in this region. 

Score Legend
Locator Map
  Index/Indicator Score     Index/Indicator Score
Benthic Index of Biotic Integrity Icon Chlorophyll a
18%
  Benthic Index of Biotic Integrity Icon Aquatic grasses
No Growth Zone
Benthic Index of Biotic Integrity Icon Dissolved oxygen
64%
  Benthic Index of Biotic Integrity Icon Benthic Index of Biotic Integrity
0%
Benthic Index of Biotic Integrity Icon Water clarity
0%
  Benthic Index of Biotic Integrity Icon Phytoplankton Index of Biotic Integrity
0%
 
Benthic Index of Biotic Integrity Icon Water Quality Index
27%
  Biotic Index Icon Biotic Index
0%
 

Excel Spreadsheet

Dynamic Conceptual Diagram

Editable Vector Diagram (SVG)

Maps

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Region Info

The Elizabeth River watershed drains approximately 200 square miles of land and flows into the mouth of the James River. The main branch of the estuary is approximately 5 mi long and 2 mi wide at its mouth. Land use on the watershed is predominantly urban with the Cities of Norfolk and Portsmouth flanking the main tributaries.

elizabeth_riverconceptual diagram.png

Editable Vector Version (SVG)