Water Quality
Water Quality > Esopus Creek > Marbletown- Ashokan Reservoir seepage

Marbletown- Ashokan Reservoir seepage

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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

27 Samples taken

Sample Date [i] Enterococcus Count
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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
10/10/2019 23 Acceptable 0.0 0.0 0.1 0.7 0.8
09/12/2019 167 Beach Advisory 0.2 0.0 0.0 0.0 0.3
08/08/2019 93 Beach Advisory 0.0 0.2 0.2 0.0 0.5
07/11/2019 26 Acceptable 0.0 0.0 0.0 0.0 0.0
06/13/2019 411 Beach Advisory 0.1 0.0 0.2 1.0 1.2
05/09/2019 41 Acceptable 0.0 0.0 0.4 0.1 0.4
10/11/2018 114 Beach Advisory 0.0 0.0 0.0 0.1 0.1
09/06/2018 167 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/09/2018 99 Beach Advisory 0.0 0.9 0.0 0.0 0.9
07/12/2018 37 Acceptable 0.0 0.0 0.0 0.0 0.0
06/07/2018 3 Acceptable 0.0 0.0 0.0 0.3 0.3
05/10/2018 56 Acceptable 0.0 0.0 0.0 0.0 0.0
10/12/2017 80 Beach Advisory 0.0 0.0 0.0 0.7 0.7
09/07/2017 59 Acceptable 0.1 0.5 0.1 0.0 0.7
08/10/2017 291 Beach Advisory 0.0 0.0 0.1 0.2 0.3
07/06/2017 222 Beach Advisory 0.0 0.0 0.0 0.0 0.0
10/13/2016 13 Acceptable 0.0 0.0 0.0 0.0 0.0
09/15/2016 19 Acceptable 0.0 0.0 0.0 0.0 0.0
08/18/2016 17 Acceptable 0.2 0.0 0.0 0.0 0.3
07/14/2016 649 Beach Advisory 0.0 0.0 0.0 0.0 0.0
06/16/2016 770 Beach Advisory 0.0 0.0 0.0 0.0 0.0
05/19/2016 6 Acceptable 0.0 0.0 0.0 0.0 0.0
10/30/2015 18 Acceptable 0.0 0.0 0.0 0.0 0.0
09/25/2015 5 Acceptable 0.0 0.0 0.0 0.0 0.0
08/28/2015 14 Acceptable 0.0 0.0 0.0 0.0 0.0
07/24/2015 17 Acceptable 0.0 0.0 0.0 0.0 0.0
06/26/2015 10 Acceptable 0.0 0.0 0.0 0.2 0.2

Entero Count (fecal indicator) and Rainfall Correlation

27 Samples taken

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 citizen scientists trained by Riverkeeper, 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:

Water that seeps beneath the Ashokan Dam flows about 3/4 mile before crossing under Route 28A and receiving the Little Beaver Kill. At this location, on Ashokan Center property, we sample seepage water just upstream of this confluence. From here the Esopus Creek flows more rapidly.

Agencies Responsible:

Ulster County Dept. of Health: 845-340-3010; NYSDEC Region 3: 845-256-3000