Harlem River- Washington Bridge

Harlem River_Wash Ave Brid copy

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

71 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
10/16/201731Acceptable0.00.00.10.00.1
09/11/201710Acceptable0.00.00.00.00.0
08/14/2017<10Acceptable0.00.00.10.00.1
07/10/2017<10Acceptable0.00.00.01.81.8
06/12/2017<10Acceptable0.00.00.00.00.0
05/15/2017144Beach Advisory0.00.01.60.01.6
10/13/201641Acceptable0.00.00.00.00.0
09/14/2016<10Acceptable0.00.00.00.00.0
08/15/201620Acceptable0.00.10.00.30.4
07/13/201652Acceptable0.00.00.00.00.0
06/15/201610Acceptable0.00.00.00.00.0
05/20/201610Acceptable0.00.00.00.00.0
10/12/201510Acceptable0.00.00.00.90.9
09/11/2015110Beach Advisory0.01.60.00.01.6
08/12/201541Acceptable0.01.20.00.01.2
07/08/201573Beach Advisory0.00.10.00.00.1
06/11/2015<10Acceptable0.00.00.00.10.1
05/12/2015<10Acceptable0.00.00.00.00.0
10/13/201410Acceptable0.00.00.30.00.3
09/07/201452Acceptable0.00.10.00.00.1
08/11/201410Acceptable0.00.00.00.00.0
07/07/2014108Beach Advisory0.00.00.00.10.1
06/12/201431Acceptable0.00.00.01.61.6
05/12/2014148Beach Advisory0.00.00.40.00.4
10/16/2013<10Acceptable0.00.00.00.00.0
09/18/201320Acceptable0.00.00.00.00.0
08/14/20131670Beach Advisory0.00.90.10.01.0
07/17/2013<10Acceptable0.00.00.00.00.0
06/19/201374Beach Advisory0.00.20.00.00.2
05/31/2013<10Acceptable0.00.00.00.50.5
10/10/2012132Beach Advisory0.30.00.00.20.5
09/10/201274Beach Advisory0.00.00.40.00.4
08/13/2012<10Acceptable0.00.00.00.20.2
07/16/201284Beach Advisory0.00.30.00.00.3
06/11/201231Acceptable0.00.00.00.00.0
05/15/201210Acceptable0.50.00.00.00.5
10/21/2011108Beach Advisory0.00.01.10.01.1
09/14/201110Acceptable0.00.00.00.00.0
08/16/2011108Beach Advisory0.00.65.80.06.4
07/19/201110Acceptable0.00.10.00.00.1
06/27/201130Acceptable0.00.00.00.00.0
05/16/2011121Beach Advisory0.20.90.00.01.1
10/12/2010816Beach Advisory0.11.10.00.01.2
09/11/201010Acceptable0.00.00.00.00.0
08/17/201041Acceptable0.00.10.20.00.3
07/21/2010<10Acceptable0.00.00.10.00.1
06/15/201010Acceptable0.00.00.30.00.3
05/21/201041Acceptable0.00.00.01.11.1
10/19/200920Acceptable0.00.30.00.10.4
09/14/200910Acceptable0.00.00.00.80.8
08/20/2009<10Acceptable0.00.00.60.00.6
07/28/200963Beach Advisory0.00.61.40.02.0
06/22/200931Acceptable0.00.50.30.00.8
06/05/200986Beach Advisory0.90.50.50.12.0
05/12/200952Acceptable0.00.00.00.60.6
10/20/200810Acceptable0.00.00.00.00.0
09/24/200810Acceptable0.00.00.00.00.0
08/19/200810Acceptable0.00.00.00.00.0
07/14/2008231Beach Advisory0.50.00.00.00.5
07/02/200843Acceptable0.00.00.00.60.6
05/19/2008<10Acceptable0.00.10.00.91.0
09/06/200727Acceptable0.00.00.00.00.0
08/16/200736Acceptable0.00.00.00.00.0
07/11/200741Acceptable0.00.00.00.00.0
06/18/200713Acceptable0.00.00.00.00.0
05/23/20078Acceptable0.00.00.00.00.0
04/18/2007244Beach Advisory0.00.00.97.68.5
12/13/200636Acceptable0.20.00.00.00.2
11/10/200692Beach Advisory0.00.03.60.03.6
10/18/20061467Beach Advisory0.01.10.00.01.1
09/26/200611Acceptable0.00.00.00.10.1

Entero Count (fecal indicator) and Rainfall Correlation

71 Samples taken

All Water Quality Parameters

71 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
10/16/201731Acceptable69.016.51.611.974.9
09/11/201710Acceptable70.214.8211.375.4
08/14/2017<10Acceptable75.519.32.18.160.2
07/10/2017<10Acceptable73.99.51.516.783.4
06/12/2017<10Acceptable68.14.9236.186.9
05/15/2017144Beach Advisory57.43.82.332.491.4
10/13/201641Acceptable66.123.92.23879
09/14/2016<10Acceptable76.2162.1n/a76
08/15/201620Acceptable81.712.8113098
07/13/201652Acceptable75.417.12.41169
06/15/201610Acceptable67.412.82.72287
05/20/201610Acceptable58.910.72.3n/a91
10/12/201510Acceptable6613.32.42283
09/11/2015110Beach Advisory77.615.741570
08/12/201541Acceptable76.814.83.51378
07/08/201573Beach Advisory72.518.42.21668
06/11/2015<10Acceptable66.419.51.5n/a73
05/12/2015<10Acceptable58.420.42.4790
10/13/201410Acceptable64.5151.22679
09/07/201452Acceptable76.914.92.72174
08/11/201410Acceptable77.212.11.82870
07/07/2014108Beach Advisory72.215.91.91169
06/12/201431Acceptable66.212.921.13396
05/12/2014148Beach Advisory56.78.51.83692
10/16/2013<10Acceptable65.818.91.3978
09/18/201320Acceptable69.322.82.3n/a72
08/14/20131670Beach Advisory73.321.121658
07/17/2013<10Acceptable74.719.51.81867
06/19/201374Beach Advisory67.514.91.72575
05/31/2013<10Acceptable62.317.61.11275
10/10/2012132Beach Advisory66.220.41.81066
09/10/201274Beach Advisory76.422.22.43252
08/13/2012<10Acceptable79.823.91.51763
07/16/201284Beach Advisory78.620.231678
06/11/201231Acceptable68.919.12n/a68
05/15/201210Acceptable60.810.32.12286
10/21/2011108Beach Advisory62.813.60.82377
09/14/201110Acceptable70.80.9218381
08/16/2011108Beach Advisory77.6121.83767
07/19/201110Acceptable7812.81.91671
06/27/201130Acceptable73.67.642074
05/16/2011121Beach Advisory57.97.72.85185
10/12/2010816Beach Advisory6613.32.11473
09/11/201010Acceptable73.613.72.23066
08/17/201041Acceptable75.824.31.91348
07/21/2010<10Acceptable79.617.25.71866
06/15/201010Acceptable7013.21.35968
05/21/201041Acceptable56.821.52.21868
10/19/200920Acceptable56.412.81.52686
09/14/200910Acceptable71.6210.94165
08/20/2009<10Acceptable79.210.12.83073
07/28/200963Beach Advisory73.519.41.11255
06/22/200931Acceptable70.32.91.18082
06/05/200986Beach Advisoryn/an/an/an/an/a
05/12/200952Acceptable59.671.14188
10/20/200810Acceptable61.522.70.9771
09/24/200810Acceptable69.721.11.2968
08/19/200810Acceptable76.910.81.62380
07/14/2008231Beach Advisory75.116.12.51876
07/02/200843Acceptable75.2132.92079
05/19/2008<10Acceptable58.410.11.15588
09/06/200727Acceptable73.624.21.61460
08/16/200736Acceptable78.413.823474
07/11/200741Acceptable73.519.71.43069
06/18/200713Acceptablen/an/an/an/an/a
05/23/20078Acceptable6118.20.92278
04/18/2007244Beach Advisory457.20.14595
12/13/200636Acceptable4691.11896
11/10/200692Beach Advisory53.84.50.34993
10/18/20061467Beach Advisory63141.81675
09/26/200611Acceptable69.518.80.3n/a73

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 Harlem River at the Washington Avenue Bridge is an industrial waterway connecting the Hudson with the East River. Contact includes recreational boating and jet-skiing, kayaking, as well as recreational and subsistence fishing from the shore. There is increasing activity from community and college crew teams.

The data displayed on these pages relates to the levels of sewage indicating microbes. Even though the levels on a single days can fall within acceptable levels for Enterococcus, these locations are not necessarily acceptable for swimming. Other water quality parameters not reported on this web site such as chemical contamination and floatables should cause users to exercise caution at this site.

Agencies Responsible:

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

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