Harlem River – Willis Ave. Bridge

Harlem River-Willis Ave. Bridge

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
09/11/2017<10Acceptable0.00.00.00.00.0
08/14/2017<10Acceptable0.00.00.10.00.1
07/10/201752Acceptable0.00.00.01.81.8
06/12/201710Acceptable0.00.00.00.00.0
05/15/2017155Beach Advisory0.00.01.60.01.6
04/04/2017884Beach Advisory1.20.00.00.01.2
10/13/2016<10Acceptable0.00.00.00.00.0
09/14/201610Acceptable0.00.00.00.00.0
08/15/201620Acceptable0.00.10.00.30.4
07/13/201610Acceptable0.00.00.00.00.0
06/15/2016<10Acceptable0.00.00.00.00.0
05/20/2016<10Acceptable0.00.00.00.00.0
10/12/201552Acceptable0.00.00.00.90.9
09/11/20151187Beach Advisory0.01.60.00.01.6
08/12/2015231Beach Advisory0.01.20.00.01.2
07/08/201510Acceptable0.00.10.00.00.1
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
09/07/2014<10Acceptable0.00.10.00.00.1
08/11/2014<10Acceptable0.00.00.00.00.0
07/07/2014<10Acceptable0.00.00.00.10.1
06/12/201410Acceptable0.00.00.01.61.6
05/12/2014109Beach Advisory0.00.00.40.00.4
10/16/201310Acceptable0.00.00.00.00.0
09/18/201320Acceptable0.00.00.00.00.0
08/14/2013173Beach Advisory0.00.90.10.01.0
07/17/2013<10Acceptable0.00.00.00.00.0
06/19/2013<10Acceptable0.00.20.00.00.2
05/31/201310Acceptable0.00.00.00.50.5
10/10/201220Acceptable0.30.00.00.20.5
09/10/201210Acceptable0.00.00.40.00.4
08/13/2012<10Acceptable0.00.00.00.20.2
07/16/201210Acceptable0.00.30.00.00.3
06/11/2012<10Acceptable0.00.00.00.00.0
05/15/2012<10Acceptable0.50.00.00.00.5
10/21/201152Acceptable0.00.01.10.01.1
09/14/201141Acceptable0.00.00.00.00.0
08/16/2011565Beach Advisory0.00.65.80.06.4
07/19/201130Acceptable0.00.10.00.00.1
06/27/2011<10Acceptable0.00.00.00.00.0
05/16/2011448Beach Advisory0.20.90.00.01.1
10/12/2010487Beach Advisory0.11.10.00.01.2
09/11/201010Acceptable0.00.00.00.00.0
08/17/201063Beach Advisory0.00.10.20.00.3
07/21/2010<10Acceptable0.00.00.10.00.1
06/15/2010<10Acceptable0.00.00.30.00.3
05/21/201010Acceptable0.00.00.01.11.1
10/19/200910Acceptable0.00.30.00.10.4
09/14/2009<10Acceptable0.00.00.00.80.8
08/20/200920Acceptable0.00.00.60.00.6
07/28/2009399Beach Advisory0.00.61.40.02.0
06/22/200985Beach Advisory0.00.50.30.00.8
06/05/2009448Beach Advisory0.90.50.50.12.0
05/12/200920Acceptable0.00.00.00.60.6
10/20/200810Acceptable0.00.00.00.00.0
09/24/2008<10Acceptable0.00.00.00.00.0
08/19/2008<10Acceptable0.00.00.00.00.0
07/14/20085635Beach Advisory0.50.00.00.00.5
07/02/200810Acceptable0.00.00.00.60.6
06/24/2008160Beach Advisory0.00.10.10.00.2
05/19/200810Acceptable0.00.10.00.91.0
09/06/20074Acceptable0.00.00.00.00.0
08/16/200719Acceptable0.00.00.00.00.0
07/11/200711Acceptable0.00.00.00.00.0
06/18/200716Acceptable0.00.00.00.00.0
05/23/20073Acceptable0.00.00.00.00.0
04/18/2007356Beach Advisory0.00.00.97.68.5
11/10/2006310Beach Advisory0.00.03.60.03.6
10/18/2006263Beach Advisory0.01.10.00.01.1
09/26/200625Acceptable0.00.00.00.10.1

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
09/11/2017<10Acceptable69.622.71.87.669.7
08/14/2017<10Acceptable74.722.52.16.855.6
07/10/201752Acceptable73.113.51.216.174.8
06/12/201710Acceptable66.813.81.517.279.4
05/15/2017155Beach Advisory55.915.21.714.283.4
04/04/2017884Beach Advisory43.817.310.911.296.9
10/13/2016<10Acceptable66.324.62.33680
09/14/201610Acceptable76.717.14.8n/a79
08/15/201620Acceptable81.916.372487
07/13/201610Acceptable74.9193.5676
06/15/2016<10Acceptable67.317.52.21683
05/20/2016<10Acceptable57.918.61.8n/a87
10/12/201552Acceptable65.714.422079
09/11/20151187Beach Advisory76.722.22.4952
08/12/2015231Beach Advisory76172.51069
07/08/201510Acceptable71.921.42.81170
06/11/2015<10Acceptable66.321.41.3n/a72
05/12/2015<10Acceptable58.122.43.43295
10/13/201410Acceptable64.7241.21474
09/07/2014<10Acceptable76.321.62.8868
08/11/2014<10Acceptable76.4171.61668
07/07/2014<10Acceptable7118.81.6767
06/12/201410Acceptable64.418.76.81882
05/12/2014109Beach Advisory56.415.12.31990
10/16/201310Acceptable65.5241577
09/18/201320Acceptable69.824.62.5n/a70
08/14/2013173Beach Advisory73.123.11.91655
07/17/2013<10Acceptable7421.62.22566
06/19/2013<10Acceptable67.417.81.51973
05/31/201310Acceptable63.120.31.1774
10/10/201220Acceptable66.322.42.1767
09/10/201210Acceptable76.824.12.62354
08/13/2012<10Acceptable78.131.70.91456
07/16/201210Acceptable77.130.82.2668
06/11/2012<10Acceptable68.621.71.6n/a66
05/15/2012<10Acceptable59.917.42884
10/21/201152Acceptable63.316.80.62576
09/14/201141Acceptable71.21.9219877
08/16/2011565Beach Advisory7519.712542
07/19/201130Acceptable74.520.71.61766
06/27/2011<10Acceptable71.117.81.91266
05/16/2011448Beach Advisory57.211.32.36681
10/12/2010487Beach Advisory65.919.71.61470
09/11/201010Acceptable72.222.21.51963
08/17/201063Beach Advisory75.8262646
07/21/2010<10Acceptable77.9251.7547
06/15/2010<10Acceptable6721.10.42462
05/21/201010Acceptable56.823.22.11375
10/19/200910Acceptable56.414.71.11884
09/14/2009<10Acceptable71.323.90.63664
08/20/200920Acceptable78.215.922063
07/28/2009399Beach Advisory73.921.51.1851
06/22/200985Beach Advisory69.55.916975
06/05/2009448Beach Advisoryn/an/an/an/an/a
05/12/200920Acceptable58.712.90.72378
10/20/200810Acceptable61.925.40.8670
09/24/2008<10Acceptable70.124.55.1883
08/19/2008<10Acceptable75.716.11.21764
07/14/20085635Beach Advisory74.1211.41165
07/02/200810Acceptable72.918.71.81269
06/24/2008160Beach Advisory69.422.51964
05/19/200810Acceptable58.4101.16387
09/06/20074Acceptable73.624.91.41059
08/16/200719Acceptable77.219.11.42359
07/11/200711Acceptable70.524.81.12157
06/18/200716Acceptablen/an/an/an/an/a
05/23/20073Acceptable60.120.81.21575
04/18/2007356Beach Advisory4512.60.11796
11/10/2006310Beach Advisory53.43.31.25292
10/18/2006263Beach Advisory63.521.91.1969
09/26/200625Acceptable7011.10.6n/a85

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:

Bronx, NY
The Harlem River at the Willis 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.

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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