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

65 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.

QualityRain, day of (in)Prior Day2 Days Prior3 Days Prior Rain4 Days Total Rain
SortSortSortSortSortSortSortSort
10/15/2017<10Acceptable0.00.10.00.10.2
09/10/201710Acceptable0.00.00.00.00.0
08/13/201741Acceptable0.00.10.00.00.1
07/09/2017<10Acceptable0.00.01.80.01.8
06/11/201710Acceptable0.00.00.00.00.0
05/14/201710Acceptable0.01.60.00.01.6
10/12/201610Acceptable0.00.00.00.60.6
09/13/2016<10Acceptable0.00.00.00.00.0
08/14/2016<10Acceptable0.00.00.30.20.5
07/12/2016<10Acceptable0.00.00.00.50.5
06/14/2016<10Acceptable0.00.00.00.00.0
05/19/2016<10Acceptable0.00.00.00.00.0
10/11/201550Acceptable0.00.00.90.00.9
09/10/2015794Beach Advisory1.60.00.00.01.6
08/11/20152909Beach Advisory1.20.00.00.01.2
07/07/2015<10Acceptable0.00.00.00.00.0
06/10/2015<10Acceptable0.00.00.10.00.1
05/11/2015<10Acceptable0.00.00.00.00.0
10/12/201420Acceptable0.00.30.00.00.3
09/07/2014<10Acceptable0.00.10.00.00.1
08/11/201420Acceptable0.00.00.00.00.0
07/07/201410Acceptable0.00.00.00.10.1
06/12/201441Acceptable0.00.00.01.61.6
05/12/201420Acceptable0.00.00.40.00.4
10/16/201310Acceptable0.00.00.00.00.0
09/18/201310Acceptable0.00.00.00.00.0
08/14/201310Acceptable0.00.90.10.01.0
07/17/201341Acceptable0.00.00.00.00.0
06/19/201375Beach Advisory0.00.20.00.00.2
05/31/201320Acceptable0.00.00.00.50.5
11/08/201286Beach Advisory0.11.10.00.01.2
10/10/2012<10Acceptable0.30.00.00.20.5
09/10/201220Acceptable0.00.00.40.00.4
08/13/2012<10Acceptable0.00.00.00.20.2
07/16/2012<10Acceptable0.00.30.00.00.3
06/11/2012<10Acceptable0.00.00.00.00.0
05/15/201210Acceptable0.50.00.00.00.5
10/21/201197Beach Advisory0.00.01.10.01.1
09/14/201152Acceptable0.00.00.00.00.0
08/16/2011144Beach Advisory0.00.65.80.06.4
07/25/2011110Beach Advisory0.00.00.00.00.0
07/22/201112033Beach Advisory0.00.00.00.00.0
07/21/2011>24196Beach Advisory0.00.00.00.10.1
07/19/2011<10Acceptable0.00.10.00.00.1
06/27/2011<10Acceptable0.00.00.00.00.0
05/16/201175Beach Advisory0.20.90.00.01.1
10/12/201041Acceptable0.11.10.00.01.2
09/11/201030Acceptable0.00.00.00.00.0
08/17/201041Acceptable0.00.10.20.00.3
07/21/2010<10Acceptable0.00.00.10.00.1
06/15/201020Acceptable0.00.00.30.00.3
05/21/2010<10Acceptable0.00.00.01.11.1
10/19/200910Acceptable0.00.30.00.10.4
09/14/2009<10Acceptable0.00.00.00.80.8
08/20/2009<10Acceptable0.00.00.60.00.6
07/28/2009<10Acceptable0.00.61.40.02.0
06/22/200941Acceptable0.00.50.30.00.8
06/06/200920Acceptable0.00.90.50.51.9
05/12/200952Acceptable0.00.00.00.60.6
10/20/200810Acceptable0.00.00.00.00.0
09/24/2008<10Acceptable0.00.00.00.00.0
08/19/200810Acceptable0.00.00.00.00.0
07/14/200879Beach Advisory0.50.00.00.00.5
07/02/200815Acceptable0.00.00.00.60.6
05/19/2008<10Acceptable0.00.10.00.91.0

Entero Count (fecal indicator) and Rainfall Correlation

65 Samples taken

All Water Quality Parameters

65 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%).

SortSortSortSortSortSortSortSort
10/15/2017<10Acceptable69.915.42.312.177.7
09/10/201710Acceptable7115.91.91673.7
08/13/201741Acceptable77.2122.213.371.9
07/09/2017<10Acceptable76.17.83.011.499.6
06/11/201710Acceptable68.54.9218.490
05/14/201710Acceptable58.53.02.021.097.1
10/12/201610Acceptable65.416.47.43190
09/13/2016<10Acceptable771244.5n/a148
08/14/2016<10Acceptable83.99.57219179
07/12/2016<10Acceptable77.810.489104
06/14/2016<10Acceptable697.63.62299
05/19/2016<10Acceptable609.61.8n/a97
10/11/201550Acceptable65.816.12.61983
09/10/2015794Beach Advisory7818.44.8968
08/11/20152909Beach Advisory75.718.44.31474
07/07/2015<10Acceptable76.66.47.42292
06/10/2015<10Acceptablen/an/an/an/an/a
05/11/2015<10Acceptable59.812.12.13391
10/12/201420Acceptable6516.91.63076
09/07/2014<10Acceptable77.711.611.31096
08/11/201420Acceptable77.811.511982
07/07/201410Acceptable75.88.810.512101
06/12/201441Acceptable67.710.633.325115
05/12/201420Acceptable60.24.32.720100
10/16/201310Acceptable65.3191.51178
09/18/201310Acceptable69.51821672
08/14/201310Acceptable75.910.99.32697
07/17/201341Acceptable80.19.46.513493
06/19/201375Beach Advisory69.64.93.61892
05/31/201320Acceptable66.16.43.55491
11/08/201286Beach Advisory51.210.10.91891
10/10/2012<10Acceptable65.98.87.6493
09/10/201220Acceptable76.412.29.26693
08/13/2012<10Acceptable83.311.913.49165
07/16/2012<10Acceptable83.613.123.210175
06/11/2012<10Acceptable719.16.1n/a82
05/15/201210Acceptable62.62.99.717103
10/21/201197Beach Advisory62.24.31.64290
09/14/201152Acceptable71.511.919880
08/16/2011144Beach Advisory78.212.61.77470
07/25/2011110Beach Advisory81.96.622.69140
07/22/201112033Beach Advisory84.76.830.915180
07/21/2011>24196Beach Advisoryn/an/an/an/an/a
07/19/2011<10Acceptable78.7121.82974
06/27/2011<10Acceptable78.12.614.742104
05/16/201175Beach Advisory58.66.32.826087
10/12/201041Acceptable66.16.44.51686
09/11/201030Acceptable73.617.324367
08/17/201041Acceptable78.715.95.51174
07/21/2010<10Acceptable83.111.673.811188
06/15/201020Acceptable70.514.32.54168
05/21/2010<10Acceptable62.311.63.32090
10/19/200910Acceptable56.112n/an/a88
09/14/2009<10Acceptable73.910.13.42690
08/20/2009<10Acceptable80.210.73.42381
07/28/2009<10Acceptable76.711.12.41675
06/22/200941Acceptable70.220.98084
06/06/200920Acceptablen/an/an/an/an/a
05/12/200952Acceptable60.651.31994
10/20/200810Acceptable62.219.91.41080
09/24/2008<10Acceptable70.9122.6885
08/19/200810Acceptable77.211.21.32278
07/14/200879Beach Advisory799.612.610122
07/02/200815Acceptable78.210.812.821108
05/19/2008<10Acceptable59.47.51.13893

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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