NYC Resources311Office of the Mayor

Official Website of the New York City Department of Parks & Recreation

Water Quality

Water Quality Baseline Data

2005, 2006

In the summer of 2005, the Natural Resources Group deployed a multi-parameter water quality logger in the estuarine portion of the Bronx River. The logger records water temperature, conductivity, and dissolved oxygen (DO) at fifteen minute intervals.

This data will be used to study the duration, frequency, and intensity of low DO events in the Bronx River estuary. Factors that impact DO concentrations include the salinity of the water, time of day, position in the water column, input of organic matter and runoff.

—Jamie Leong


The data logger is a YSI Environmental 600-XLM Sonde.

Housing for the sonde has been constructed at two points in the Bronx River estuary:

Cement Plant Park

Edgewater Rd. between Westchester Ave. and the Bruckner Expressway: The sonde is housed within a galvanized steel pipe attached to a concrete bulkhead located on the west shore of the Bronx River.

Drew Gardens

East Tremont Ave and the Bronx River: The sonde is located about halfway between CSO outfall HP-007 and CSO outfall HP-004 in a galvanized steel pipe attached to concrete blocks at both ends. The pipe is secured in the thalweg of the river, closer to the eastern shore.

Dissolved oxygen, conductivity, temperature and depth measurements are collected at 15 minute intervals for periods of 1 to 2 weeks.

Cement Plant Park

June 30, 2005 - July 14, 2005

July 15, 2005 - July 28, 2005

September 27, 2005 - October 10, 2005

October 11, 2005 - October 24, 2005

Drew Gardens

July 28, 2005 - August 12, 2005

August 12, 2005 - August 25, 2005

August 26, 2005 - September 10, 2005

September 10, 2005 - September 27, 2005

May 9, 2006 - June 2, 2006

Download water quality data collected with the sonde at Cement Plant (Excel file, 561 KB)

Download water quality data collected with the sonde at Drew Gardens (Excel file, 723 KB)

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