Chesapeake Bay Coastal Bays Rivers and Streams Watersheds
Maryland Department of Natural Resources
Fixed Station Monthly Monitoring
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Patuxent River - Nottingham (TF1.5)

Map Showing the Location of TF1.5

Nottingham, Just South of the Merkle Wildlife Management Area on the Upper Patuxent River

Coordinates (NAD83):
Latitude: 38.7101
Longitude: -76.7014

This station is a tidal freshwater site in the mid-channel of the Patuxent River approximately 35 feet deep.

Current Parameter: Water Clarity (Secchi Depth)

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.

2015 Water Clarity (Secchi Depth)
Patuxent River / Nottingham (TF1.5)


Range 1985 to 2014 2015 Mean

Water Clarity (Secchi Depth) (meters)
Patuxent River / Nottingham (TF1.5)
Month Minimum Mean Maximum 2014 2015
January 0.10 0.27 0.40 0.20 Not Sampled
February 0.10 0.32 0.90 0.10 Not Sampled
March 0.10 0.25 0.40 0.10 0.30
April 0.10 0.32 0.45 0.40 0.20
May 0.10 0.32 0.45 Not Sampled Not Sampled
June 0.15 0.30 0.50 0.20 0.30
July 0.20 0.31 0.45 0.20 0.30
August 0.20 0.32 0.45 0.40  
September 0.20 0.31 0.50 0.30  
October 0.20 0.29 0.45 0.30  
November 0.10 0.30 0.50 0.40  
December 0.10 0.24 0.40 Not Sampled  

*Bottom - "Secchi Disk Was Visible On Bottom":
When the Secchi disk is still visible on the bay floor it means that the water is clear enough for light to penetrate to the depth of the disk, reflect off of the disk, and reach the surface of the water again. Most of the time, this means that there is enough light for submerged aquatic plants to grow to that depth.

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:
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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