Dyckman Street Beach

Dyckman St. Beach

Physical/Chemical Data

Physical, chemical and biological properties of the surface water that are measured continuously while the patrol boat is underway.

Entero Count (fecal indicator) and Rainfall

61 Samples taken

Sample Date [i] Enterococcus Count

Entero Count

Enterococcus (“Entero”) is a fecal indicating bacterium that lives in the intestines of humans and other warm-blooded animals. It is the EPA preferred indicator for sewage contamination.

Quality Rain, day of (in) Prior Day 2 Days Prior 3 Days Prior Rain 4 Days Total Rain
Sort Sort Sort Sort Sort Sort Sort Sort
06/11/2017 10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/14/2017 10 Acceptable 0.0 1.6 0.0 0.0 1.6
10/12/2016 10 Acceptable 0.0 0.0 0.0 0.6 0.6
09/13/2016 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/14/2016 <10 Acceptable 0.0 0.0 0.3 0.2 0.5
07/12/2016 <10 Acceptable 0.0 0.0 0.0 0.5 0.5
06/14/2016 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/19/2016 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
10/11/2015 50 Acceptable 0.0 0.0 0.9 0.0 0.9
09/10/2015 794 Beach Advisory 1.6 0.0 0.0 0.0 1.6
08/11/2015 2909 Beach Advisory 1.2 0.0 0.0 0.0 1.2
07/07/2015 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
06/10/2015 <10 Acceptable 0.0 0.0 0.1 0.0 0.1
05/11/2015 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
10/12/2014 20 Acceptable 0.0 0.3 0.0 0.0 0.3
09/07/2014 <10 Acceptable 0.0 0.1 0.0 0.0 0.1
08/11/2014 20 Acceptable 0.0 0.0 0.0 0.0 0.0
07/07/2014 10 Acceptable 0.0 0.0 0.0 0.1 0.1
06/12/2014 41 Acceptable 0.0 0.0 0.0 1.6 1.6
05/12/2014 20 Acceptable 0.0 0.0 0.4 0.0 0.4
10/16/2013 10 Acceptable 0.0 0.0 0.0 0.0 0.0
09/18/2013 10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/14/2013 10 Acceptable 0.0 0.9 0.1 0.0 1.0
07/17/2013 41 Acceptable 0.0 0.0 0.0 0.0 0.0
06/19/2013 75 Beach Advisory 0.0 0.2 0.0 0.0 0.2
05/31/2013 20 Acceptable 0.0 0.0 0.0 0.5 0.5
11/08/2012 86 Beach Advisory 0.1 1.1 0.0 0.0 1.2
10/10/2012 <10 Acceptable 0.3 0.0 0.0 0.2 0.5
09/10/2012 20 Acceptable 0.0 0.0 0.4 0.0 0.4
08/13/2012 <10 Acceptable 0.0 0.0 0.0 0.2 0.2
07/16/2012 <10 Acceptable 0.0 0.3 0.0 0.0 0.3
06/11/2012 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/15/2012 10 Acceptable 0.5 0.0 0.0 0.0 0.5
10/21/2011 97 Beach Advisory 0.0 0.0 1.1 0.0 1.1
09/14/2011 52 Acceptable 0.0 0.0 0.0 0.0 0.0
08/16/2011 144 Beach Advisory 0.0 0.6 5.8 0.0 6.4
07/25/2011 110 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/22/2011 12033 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/21/2011 >24196 Beach Advisory 0.0 0.0 0.0 0.1 0.1
07/19/2011 <10 Acceptable 0.0 0.1 0.0 0.0 0.1
06/27/2011 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/16/2011 75 Beach Advisory 0.2 0.9 0.0 0.0 1.1
10/12/2010 41 Acceptable 0.1 1.1 0.0 0.0 1.2
09/11/2010 30 Acceptable 0.0 0.0 0.0 0.0 0.0
08/17/2010 41 Acceptable 0.0 0.1 0.2 0.0 0.3
07/21/2010 <10 Acceptable 0.0 0.0 0.1 0.0 0.1
06/15/2010 20 Acceptable 0.0 0.0 0.3 0.0 0.3
05/21/2010 <10 Acceptable 0.0 0.0 0.0 1.1 1.1
10/19/2009 10 Acceptable 0.0 0.3 0.0 0.1 0.4
09/14/2009 <10 Acceptable 0.0 0.0 0.0 0.8 0.8
08/20/2009 <10 Acceptable 0.0 0.0 0.6 0.0 0.6
07/28/2009 <10 Acceptable 0.0 0.6 1.4 0.0 2.0
06/22/2009 41 Acceptable 0.0 0.5 0.3 0.0 0.8
06/06/2009 20 Acceptable 0.0 0.9 0.5 0.5 1.9
05/12/2009 52 Acceptable 0.0 0.0 0.0 0.6 0.6
10/20/2008 10 Acceptable 0.0 0.0 0.0 0.0 0.0
09/24/2008 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/19/2008 10 Acceptable 0.0 0.0 0.0 0.0 0.0
07/14/2008 79 Beach Advisory 0.5 0.0 0.0 0.0 0.5
07/02/2008 15 Acceptable 0.0 0.0 0.0 0.6 0.6
05/19/2008 <10 Acceptable 0.0 0.1 0.0 0.9 1.0

Entero Count (fecal indicator) and Rainfall Correlation

61 Samples taken

All Water Quality Parameters

61 Samples taken

Sample Date [i] Entero Count

Entero Count

Enterococcus (“Entero”) is a fecal indicating bacterium that lives in the intestines of humans and other warm-blooded animals. It is the EPA preferred indicator for sewage contamination.

Quality [i] Temp (f)

Temperature

Hudson River water temperature changes seasonally. Surface water temperature can change on small scales in the river reflecting natural and human influences.

[i] Salinity

Salinity

Estuaries like the Hudson are where freshwaters in rivers meet the sea. Salinity tells us about the relative contribution of fresh and salt water within a particular region of the estuary. 

[i] Chlorophyll

Chlorophyll

A measure of the amount of microscopic algae present in the water. High chlorophyll counts can mean high levels of the nutrients phosphorus and nitrogen, and the threat, or presence, of algae blooms.

[i] Turbidity

Turbidity

Turbidity is a measure of the amount of fine particles suspended in the water. As turbidity rises, light penetration, a key factor for aquatic plants and algae, diminishes.

[i] Oxygen

Oxygen

Oxygen concentrations in the water are closely connected to biological activities. Surface waters are typically in equilibrium with the atmosphere such that the oxygen concentration near the surface is close to fully saturated (100%).

Sort Sort Sort Sort Sort Sort Sort Sort
06/11/2017 10 Acceptable 68.5 4.9 2 18.4 90
05/14/2017 10 Acceptable 58.5 3.0 2.0 21.0 97.1
10/12/2016 10 Acceptable
09/13/2016 <10 Acceptable 77.0 12.0 44.5 n/a 148.2
08/14/2016 <10 Acceptable 83.9 9.5 72 18.7 178.9
07/12/2016 <10 Acceptable 77.8 10.4 8 9 103.7
06/14/2016 <10 Acceptable 69 7.6 3.6 21.6 98.9
05/19/2016 <10 Acceptable 60 9.6 1.8 n/a 96.8
10/11/2015 50 Acceptable 65.8 16.1 2.6 19 83
09/10/2015 794 Beach Advisory 78 18.4 4.8 9 68
08/11/2015 2909 Beach Advisory 75.7 18.4 4.3 14 74
07/07/2015 <10 Acceptable 76.6 6.4 7.4 22 92
06/10/2015 <10 Acceptable n/a n/a n/a n/a n/a
05/11/2015 <10 Acceptable 59.8 12.1 2.1 33 91
10/12/2014 20 Acceptable 65 16.9 1.6 30 76
09/07/2014 <10 Acceptable 77.7 11.6 11.3 10 96
08/11/2014 20 Acceptable 77.8 11.5 1 19 82
07/07/2014 10 Acceptable 75.8 8.8 10.5 12 101
06/12/2014 41 Acceptable 67.7 10.6 33.3 25 115
05/12/2014 20 Acceptable 60.2 4.3 2.7 20 100
10/16/2013 10 Acceptable 65.3 19 1.5 11 78
09/18/2013 10 Acceptable 69.5 18 2 16 72
08/14/2013 10 Acceptable 75.9 10.9 9.3 26 97
07/17/2013 41 Acceptable 80.1 9.4 6.5 134 93
06/19/2013 75 Beach Advisory 69.6 4.9 3.6 18 92
05/31/2013 20 Acceptable 66.1 6.4 3.5 54 91
11/08/2012 86 Beach Advisory 51.2 10.1 0.9 18 91
10/10/2012 <10 Acceptable 65.9 8.8 7.6 4 93
09/10/2012 20 Acceptable 76.4 12.2 9.2 66 93
08/13/2012 <10 Acceptable 83.3 11.9 13.4 9 165
07/16/2012 <10 Acceptable 83.6 13.1 23.2 10 175
06/11/2012 <10 Acceptable 71 9.1 6.1 n/a 82
05/15/2012 10 Acceptable 62.6 2.9 9.7 17 103
10/21/2011 97 Beach Advisory 62.2 4.3 1.6 42 90
09/14/2011 52 Acceptable 71.5 1 1.9 198 80
08/16/2011 144 Beach Advisory 78.2 12.6 1.7 74 70
07/25/2011 110 Beach Advisory 81.9 6.6 22.6 9 140
07/22/2011 12033 Beach Advisory 84.7 6.8 30.9 15 180
07/21/2011 >24196 Beach Advisory n/a n/a n/a n/a n/a
07/19/2011 <10 Acceptable 78.7 12 1.8 29 74
06/27/2011 <10 Acceptable 78.1 2.6 14.7 42 104
05/16/2011 75 Beach Advisory 58.6 6.3 2.8 260 87
10/12/2010 41 Acceptable 66.1 6.4 4.5 16 86
09/11/2010 30 Acceptable 73.6 17.3 2 43 67
08/17/2010 41 Acceptable 78.7 15.9 5.5 11 74
07/21/2010 <10 Acceptable 83.1 11.6 73.8 11 188
06/15/2010 20 Acceptable 70.5 14.3 2.5 41 68
05/21/2010 <10 Acceptable 62.3 11.6 3.3 20 90
10/19/2009 10 Acceptable 56.1 12 n/a n/a 88
09/14/2009 <10 Acceptable 73.9 10.1 3.4 26 90
08/20/2009 <10 Acceptable 80.2 10.7 3.4 23 81
07/28/2009 <10 Acceptable 76.7 11.1 2.4 16 75
06/22/2009 41 Acceptable 70.2 2 0.9 80 84
06/06/2009 20 Acceptable n/a n/a n/a n/a n/a
05/12/2009 52 Acceptable 60.6 5 1.3 19 94
10/20/2008 10 Acceptable 62.2 19.9 1.4 10 80
09/24/2008 <10 Acceptable 70.9 12 2.6 8 85
08/19/2008 10 Acceptable 77.2 11.2 1.3 22 78
07/14/2008 79 Beach Advisory 79 9.6 12.6 10 122
07/02/2008 15 Acceptable 78.2 10.8 12.8 21 108
05/19/2008 <10 Acceptable 59.4 7.5 1.1 38 93

Water Quality*

Acceptable (0–60) Beach Advisory (61+)

*Single sample thresholds;
Enterococcus count per 100mL

Prior Four Day Rainfall
(in inches)

Dry Weather (0–0.25) Wet Weather (0.25+)

Enterococcus is an EPA-approved fecal contamination indicator.

Samples taken by Riverkeeper, Lamont-Doherty Earth Observatory and CUNY Queens College staff, and processed on the Riverkeeper vessel, according to the 2014 Quality Assurance Project Plan.

Rainfall data comes from wunderground.com. Wet weather is a common trigger of fecal contamination.

What do the Numbers Mean?

Water Quality scoring is based on the 2012 Recreational Water Quality Criteria from the US Environmental Protection Agency (EPA) for safe swimming. Learn More

About this location:

Manhattan, NY
The sample site at Inwood Hill Park has fishing, kayaking, team rowing, recreational boating and casual water contact at the beach. There is a combined sewer overflow (CSO) under the pier at this site.

Agencies Responsible:

NYCDEP: 212-639-9675 and NYSDEC Region 2: 718-482-4933

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