Water Quality
Water Quality > Tributary and Waterfront Data > Mohawk River > Halfmoon- I-87 crossing

Halfmoon- I-87 crossing

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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

49 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
10/15/2023 214 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/17/2023 76 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/20/2023 488 Beach Advisory 0.0 0.0 1.8 0.0 1.8
07/06/2023 228 Beach Advisory 0.0 0.0 0.0 0.5 0.5
06/07/2023 37 Acceptable 0.0 0.0 0.2 0.0 0.2
05/22/2023 28 Acceptable 0.0 0.0 0.3 0.0 0.3
10/16/2022 517 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/18/2022 >2420 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/21/2022 86 Beach Advisory 0.0 0.0 0.0 0.1 0.1
07/10/2022 50 Acceptable 0.0 0.0 0.0 0.0 0.0
06/11/2022 49 Acceptable 0.0 0.0 0.0 0.0 0.0
05/24/2022 29 Acceptable 0.0 0.0 0.0 0.0 0.0
10/24/2021 130 Beach Advisory 0.0 0.0 0.2 0.0 0.2
09/26/2021 >2420 Beach Advisory 0.0 0.0 1.2 0.6 1.7
08/29/2021 816 Beach Advisory 0.0 0.2 0.0 0.0 0.2
07/26/2021 649 Beach Advisory 0.0 0.4 0.0 0.0 0.4
06/21/2021 >2420 Beach Advisory 0.0 0.0 0.1 0.0 0.1
05/24/2021 43 Acceptable 0.0 0.0 0.0 0.0 0.0
10/25/2020 58 Acceptable 0.0 0.0 0.0 0.0 0.0
09/20/2020 >2420 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/16/2020 60 Acceptable 0.0 0.0 0.0 0.0 0.0
07/17/2020 1986 Beach Advisory 0.6 0.4 0.0 0.8 1.7
06/23/2020 65 Beach Advisory 0.0 0.0 0.0 0.0 0.0
10/13/2019 53 Acceptable 0.0 0.0 0.0 0.0 0.0
09/15/2019 10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/11/2019 25 Acceptable 0.0 0.0 0.0 0.8 0.8
07/14/2019 55 Acceptable 0.0 0.0 0.0 0.1 0.1
05/14/2019 1046 Beach Advisory 0.1 0.7 0.4 0.0 1.2
10/15/2018 250 Beach Advisory 0.0 0.0 0.2 0.0 0.2
09/17/2018 40 Acceptable 0.0 0.0 0.0 0.0 0.0
08/19/2018 1414 Beach Advisory 0.0 0.1 0.4 0.0 0.5
07/22/2018 79 Beach Advisory 0.3 0.0 0.0 0.0 0.3
06/18/2018 16 Acceptable 0.0 0.0 0.0 0.1 0.1
05/18/2018 4 Acceptable 0.0 0.0 0.0 0.2 0.2
10/23/2017 3 Acceptable 0.0 0.0 0.0 0.0 0.0
09/18/2017 15 Acceptable 0.0 0.0 0.0 0.0 0.0
08/21/2017 7 Acceptable 0.0 0.0 0.0 0.9 0.9
07/17/2017 21 Acceptable 0.0 0.0 0.0 0.0 0.0
06/17/2017 36 Acceptable 0.0 0.6 0.0 0.0 0.6
05/22/2017 5 Acceptable 0.2 0.0 0.0 0.0 0.2
10/22/2016 64 Beach Advisory 0.3 0.1 0.4 0.0 0.9
09/19/2016 16 Acceptable 0.0 0.0 0.0 0.0 0.0
08/20/2016 42 Acceptable 0.0 0.0 0.0 0.0 0.0
08/02/2016 1553 Beach Advisory 1.3 0.1 1.3 0.0 2.7
07/29/2016 140 Beach Advisory 0.1 0.0 0.0 0.0 0.1
07/27/2016 549 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/18/2016 <1 Acceptable 0.0 0.6 0.0 0.0 0.6
07/05/2016 53 Acceptable 0.0 0.0 0.0 0.0 0.0
06/19/2016 <1 Acceptable 0.0 0.0 0.0 0.0 0.0

Entero Count (fecal indicator) and Rainfall Correlation

49 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 and processed at laboratories that aren't directly affiliated with Riverkeeper, using methods and study designs that are consistent with Riverkeeper's Hudson River and Citizen Testing programs.

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:

This site is located near drinking water intakes on the Mohawk River, one of the sources for Latham Water District, which serves approximately 82,000 people in the Town of Colonie.

Agencies Responsible:

NYS Dept. of Health, Glens Falls District Office: 518-793-3893; NYSDEC Region 5: 518-897-1200

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