Hudson above Troy Lock

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.

QualityRain, day of (in)Prior Day2 Days Prior3 Days Prior Rain4 Days Total Rain
SortSortSortSortSortSortSortSort
09/14/2017122Beach Advisory0.00.00.00.00.0
08/17/2017435Beach Advisory0.00.00.00.00.0
07/13/201733Acceptable0.20.10.10.00.3
06/15/201731Acceptable0.00.00.00.00.0
05/18/20173Acceptable0.00.00.00.30.3
04/07/201793Beach Advisory0.00.50.00.91.4
10/18/201651Acceptable0.00.00.00.00.0
09/17/2016272Beach Advisory0.00.00.00.00.0
08/18/2016211Beach Advisory0.00.00.20.00.2
07/16/201622Acceptable0.00.10.10.00.2
06/18/20169Acceptable0.00.00.00.00.0
05/23/201624Acceptable0.00.00.00.00.0
10/15/201550Acceptable0.00.00.00.00.0
09/14/2015231Beach Advisory0.00.91.20.12.2
08/15/201561Beach Advisory0.30.30.00.00.6
07/11/2015150Beach Advisory0.00.01.20.01.2
06/13/2015365Beach Advisory0.01.30.00.01.3
05/14/201521Acceptable0.00.00.10.00.1
10/16/2014285Beach Advisory0.30.10.00.00.4
09/10/201460Acceptable0.00.00.00.00.0
08/14/2014133Beach Advisory0.00.10.00.00.1
07/10/2014727Beach Advisory0.01.70.40.32.4
06/15/20141300Beach Advisory0.00.50.50.11.1
05/15/2014120Beach Advisory0.10.10.00.00.2
10/21/2013117Beach Advisory0.00.00.00.20.2
09/21/2013199Beach Advisory0.00.00.00.00.0
08/19/201341Acceptable0.00.00.00.00.0
07/21/201367Beach Advisory0.00.00.00.00.0
06/24/20131203Beach Advisory1.40.00.00.01.4
06/04/2013980Beach Advisory0.00.01.10.11.2
10/15/201265Beach Advisory0.40.50.00.11.0
09/15/201264Beach Advisory0.10.00.00.00.1
08/18/201233Acceptable0.00.10.00.20.3
07/21/201228Acceptable0.00.00.00.20.2
06/16/201249Acceptable0.00.00.00.20.2
05/20/201296Beach Advisory0.00.00.00.00.0
10/16/20111553Beach Advisory0.00.11.10.31.5
09/19/201172Beach Advisory0.00.00.00.10.1
08/21/2011727Beach Advisory0.40.00.00.00.4
07/14/2011108Beach Advisory0.00.30.00.00.3
07/02/201163Beach Advisory0.00.01.01.12.1
05/19/201196Beach Advisory0.80.20.10.51.6
10/16/20101986Beach Advisory0.01.00.30.01.3
09/14/201032Acceptable0.00.00.00.00.0
08/23/2010345Beach Advisory0.10.40.00.10.6
08/21/201067Beach Advisory0.00.10.10.00.2
07/19/2010579Beach Advisory0.00.20.50.00.7
06/18/2010387Beach Advisory0.00.00.20.00.2
05/25/201030Acceptable0.00.00.00.00.0
10/23/200922Acceptable0.00.00.00.00.0
09/17/200999Beach Advisory0.00.00.00.00.0
08/24/2009260Beach Advisory0.00.31.01.52.8
07/31/2009>2420Beach Advisory0.60.31.00.01.9
06/13/2009272Beach Advisory0.00.30.30.00.6
05/15/200954Acceptable0.00.50.00.00.5
10/23/20084Acceptable0.00.20.10.00.3
09/18/200811Acceptable0.00.00.00.00.0
08/09/200842Acceptable0.00.01.30.21.5
07/17/200817Acceptable0.00.00.00.10.1
06/19/200845Acceptable0.00.40.10.91.4
05/22/200834Acceptable0.20.00.00.00.2

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%).

SortSortSortSortSortSortSortSort
09/14/2017122Beach Advisory69.60.13.36.7103
08/17/2017435Beach Advisory78.30.14.46.6105.7
07/13/201733Acceptable74.90.10.816.8102.5
06/15/201731Acceptable72.80.11.914.6105.2
05/18/20173Acceptable63.60.11.919.0110.1
04/07/201793Beach Advisoryn/an/an/an/an/a
10/18/201651Acceptable62.60.11.534101
09/17/2016272Beach Advisory73.50.11.5n/a98
08/18/2016211Beach Advisory81.60.13.426105
07/16/201622Acceptable81.70.13.31799
06/18/20169Acceptable74.80.10.322106
05/23/201624Acceptable64.90.10.220103
10/15/201550Acceptable60.10.12.75101
09/14/2015231Beach Advisory740.12.11191
08/15/201561Beach Advisory80.60.17.87106
07/11/2015150Beach Advisory75.30.13.718106
06/13/2015365Beach Advisoryn/an/an/an/an/a
05/14/201521Acceptable680.129107
10/16/2014285Beach Advisory63.10.14.914101
09/10/201460Acceptable75.20.10.51199
08/14/2014133Beach Advisory75.50.12.3595
07/10/2014727Beach Advisory76.60.1146103
06/15/20141300Beach Advisory69.30.11.451109
05/15/2014120Beach Advisory61.90.1110107
10/21/2013117Beach Advisory590.11.710899
09/21/2013199Beach Advisory67.60.12.924108
08/19/201341Acceptable750.11.259106
07/21/201367Beach Advisory81.90.12.519110
06/24/20131203Beach Advisory74.10.11.732106
06/04/2013980Beach Advisory68.90.10.540104
10/15/201265Beach Advisory56.80.1212100
09/15/201264Beach Advisory72.40.11.25103
08/18/201233Acceptable800.12.14116
07/21/201228Acceptable82.60.17.89131
06/16/201249Acceptable74.60.11.615109
05/20/201296Beach Advisory66.60.1122107
10/16/20111553Beach Advisory59.90.11.978102
09/19/201172Beach Advisory64.60.10.913105
08/21/2011727Beach Advisory77.70.12.720100
07/14/2011108Beach Advisory76.90.15.74n/a
07/02/201163Beach Advisory73.40.10.78n/a
05/19/201196Beach Advisoryn/an/an/an/an/a
10/16/20101986Beach Advisory540.12.248102
09/14/201032Acceptable69.10.14.75100
08/23/2010345Beach Advisoryn/an/an/an/an/a
08/21/201067Beach Advisory77.30.13n/a98
07/19/2010579Beach Advisory81.40.16.5389
06/18/2010387Beach Advisory71.50.14.67105
05/25/201030Acceptable75.70.16.7127116
10/23/200922Acceptable50.30.10.42299
09/17/200999Beach Advisory67.80.12.1595
08/24/2009260Beach Advisory77.60.11.954105
07/31/2009>2420Beach Advisory72.70.12.1139103
06/13/2009272Beach Advisoryn/an/an/an/an/a
05/15/200954Acceptable64.2n/a1.25111
10/23/20084Acceptable52.20.11.5297
09/18/200811Acceptablen/an/an/an/an/a
08/09/200842Acceptablen/an/an/an/an/a
07/17/200817Acceptable800.12.115107
06/19/200845Acceptablen/an/an/an/an/a
05/22/200834Acceptable59.50.19.914110

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:

Troy, NY
The Hudson River, above the lock at Troy, is no longer part of the estuary. This site has boating, kayaking, recreational and subsistence fishing, and occasional swimming.

Agencies Responsible:

Rensselaer County Dept. of Health: 518-270-2655, Albany County Dept. of Health: 518-447-4580 and NYSDEC Region 4: 518-357-2045

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