Chesapeake Bay Coastal Bays Rivers and Streams Watersheds
Maryland Department of Natural Resources
Fixed Station Monthly Monitoring
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Chesapeake Bay Mainstem - MD Mid Bay (CB4.2C)

Map Showing the Location of CB4.2C

Location:
Southwest of Tilghman Island

Coordinates (NAD83):
Latitude: 38.6448
Longitude: -76.4177

Description:
This station is a mid-channel site located in the mid Chesapeake Bay, southwest of Tilghman Island. The station is located in the mesohaline zone (salinity 5 to 18 ppt) with an approximate depth of 26 meters. Stations in this section of the Bay monitor water quality of the deep trough near the Choptank River.

Current Parameter: pH

Choose Other Parameters:
Dissolved
Oxygen
Water
Temperature
Salinity pH Water
Clarity


The yellow shaded area represents the range of monthly mean values that have occurred from 1985 to 2012. The blue line shows the monthly mean values for each month over that same time period. The red line shows what the current years conditions are and how they compare to the range and the average values we've seen.

*Note that the Mean pH is now correctly calculated by converting pH values to the representative H+ ion concentrations, averaging those concentrations, and converting back to pH scale. Prior to 2012, we were displaying averages of pH readings, which was statistically incorrect since pH readings are on a logarithmic scale.

2013 Surface Water pH
Chesapeake Bay Mainstem / MD Mid Bay (CB4.2C)

Legend

Range 1985 to 2012 2013 Mean

Surface Water pH
Chesapeake Bay Mainstem / MD Mid Bay (CB4.2C)
Month Minimum Mean Maximum 2012 2013
January 7.70 7.99 8.30 8.20 8.40
February 7.60 8.00 8.40 8.00 8.10
March 7.50 8.02 8.40 8.30 8.30
April 7.72 8.07 8.50 8.40 8.90
May 7.70 8.13 8.80 7.90 8.60
June 7.29 8.12 8.60 7.80 8.40
July 7.85 8.19 8.52 8.10 8.35
August 7.85 8.12 8.75 8.10 8.10
September 7.70 7.99 8.40 7.90 7.90
October 7.64 7.93 8.20 8.20 7.80
November 7.17 7.92 8.40 8.10 8.10
December 7.60 8.00 8.50 8.50 8.20

NOTE: Results displayed are provisional and have not undergone full Quality Assurance procedures. Although Maryland DNR believes the data presented here are correct, we cannot guarantee their accuracy at this time.

Choose Other Parameters:
Dissolved
Oxygen
Water
Temperature
Salinity pH Water
Clarity

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Additional water quality data, including nutrient data, is currently available through the Chesapeake Bay Program Data Hub.

Contact MD DNR's Resource Assessment Service at (410) 260-8630
or by email at eyesonthebay@dnr.state.md.us.


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