Chesapeake Bay Coastal Bays Rivers and Streams Watersheds
Maryland Department of Natural Resources
Fixed Station Monthly Monitoring
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Water Quality Mapping

Chesapeake Bay Mainstem - Bay Bridge (CB3.3C)

Map Showing the Location of CB3.3C

North of the Chesapeake Bay Bridge

Coordinates (NAD83):
Latitude: 38.9951
Longitude: -76.3597

This station is a mid-channel site located in the upper Chesapeake Bay, just north of the Bay Bridge. This station is located in the turbidity maximum, where salt water from the ocean and freshwater from the upper Bay mix. The station is in the mesohaline zone (salinity 5 to 18 ppt); however, the station has quite a range in salinity. The approximate depth is 21 meters.

Current Parameter: Water Temperature

Choose Other Parameters:
Salinity pH Water

The yellow shaded area represents the range of monthly mean values that have occurred from 1985 to 2014. 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.

To convert temperature to Fahrenheit, use the conversion tool below.

2015 Surface Water Temperature
Chesapeake Bay Mainstem / Bay Bridge (CB3.3C)


Range 1985 to 2014 2015 Mean

Surface Water Temperature (F)
Chesapeake Bay Mainstem / Bay Bridge (CB3.3C)
Month Minimum Mean Maximum 2014 2015
January 30.92 37.39 45.14 Not Sampled 36.14
February 30.92 36.44 41.72 34.34 35.60
March 36.68 42.72 49.10 38.30 38.84
April 50.09 53.60 59.72 54.50 46.58
May 57.56 63.75 75.20 69.62 64.04
June 69.08 74.20 78.98 73.31 76.46
July 76.19 80.40 83.57 79.16 81.68
August 77.63 80.40 83.12 79.07  
September 68.90 74.81 81.14 74.30  
October 57.02 64.15 69.62 64.22  
November 46.22 53.12 60.62 46.22  
December 36.86 43.92 52.70 42.08  

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.

Temperature Conversion       
Enter a reading on the left side and select the units of the original value. The converted temperature will be displayed on the right.
Choose Other Parameters:
Salinity pH Water

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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

Chesapeake Bay | Coastal Bays | Rivers & Streams | Watersheds

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