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Water Quality Data for 2010

The data below were collected at three sites sites on the Woonasquatucket River under the URI Watershed Watch Program:

  1. Greystone Pond, Johnston - N. Providence
  2. Donigian Park, Providence
  3. Waterplace Park, Providence

For more details about our monitoring program, the parameters we monitor, and links to more data, see the overview page for our water quality monitoring program. Data for other years are also available from this page as well as from the sidebar at right.

The water quality of many of the lakes and ponds in the watershed is also being monitored under the URI Watershed Watch program. The data for these sites are available on the Watershed Watch web site.


Bacteria: Samples for bacteria testing are collected once a month during the monitoring season and taken to the URI Watershed Watch lab for analysis. These results are generally available within about a week of the monitoring date.

In 2006 Watershed Watch began testing for the bacteria group enterococci, instead of fecal coliforms. This change was made because the US EPA identified enterococci as a better indicator of the risk of contacting gastrointestinal disorders as a result of coming into contact with the water than fecal coliforms. As a result of this finding, RI DEM and RI Department of Health are also switching to using enterococci as their standard for recreational contact (swimming). Prior to the to 2006 the bacteria groups tested for where e. coli or fecal coliforms.

The Rhode Island standard for freshwater used for recreation is 61 enterococci (count per 100 ml). For more information visit the URI Watershed Watch web site and, in particular, read this PDF document on bacterial monitoring

Enterococci (count per 100 ml):

Site May June July August October October
Greystone Pond 24.1 201.2 480 105.6 52.4 >4840
Donigian Park 61.2 >4839.2 690.8 821.2 139 7945.2
Waterplace Park 123.4 8664 663 3076 298 1782

Dissolved oxygen is important to the health of animals that live in the river because they need air to breath too. If the dissolved oxygen drops below 3 mg/L aquatic animals cannot survive. Between 3 and 5 mg/L it is hard for organisms to function, and above 5 is good. Oxygen levels are generally higher in the spring when the water is cold, because cold water can hold more oxygen. For more information visit the URI Watershed Watch web site and, in particular, read this PDF document on dissolved oxygen.

To run the test, two samples are collected and two tests are run on each sample. The four results are averaged to get the final value. The test used is the modified Winkler titration test. The dates listed below are the Saturday of the weekend on which the data were supposed to be collected. In some cases the samples were collected a few days before or after the date listed. See the detailed results below for the exact dates on which samples were collected.

Dissolved Oxygen (mg/L):

Site 5/15 5/29 6/12 6/19 7/3 7/17 7/31 8/14 8/28 9/11 10/9 10/16
Greystone Pond 5.6 4.0 4.5 4.0 4.6 3.8 4.4 5.4 4.8 5.2 6.4 7.8
Donigian Park 8.5 - 8.1 6.5 5.9 - 5.7 6.9 7.6 7.9 8.8 9.3
Waterplace Park 8.1 7.1 5.9 4.4 2.9 5.6 6.4 8.2 6.2 5.6 7.7 8.6

Dissolved Oxygen (% Saturation):

Site 5/15 5/29 6/12 6/19 7/3 7/17 7/31 8/14 8/28 9/11 10/9 10/16
Greystone Pond 56 44 48 45 52 42 50 61 53 55 64 75
Donigian Park 84 - 87 74 69 - 68 77 83 79 87 88
Waterplace Park 80 78 62 49 33 68 72 56 67 67 76 80

Nutrients: Data on nutrients such as nitrogen and phosphorus are determined from samples delivered to URI along with the bacteria samples. However, the nutrient samples are not processed by Watershed Watch until after the end of the monitoring season. The data are typically posted on the URI Watershed Watch website sometime during the winter.


Collection Notes:

Saturday May 15, 2010 :: 7:10AM

Greystone Pond, Johnston - N. Providence

Data Collected by: Emily and Kara Papazian

Weather: clear, light wind Water Temperature: 15.4 C (59.7 F)
Rainfall in the past 48 hours*: 4mm (0.16") Dissolved Oxygen: 5.6 mg/L

Saturday May 15, 2010 :: 8:00AM

Donigian Park, Providence

Data Collected by: Beth Faria

Weather: clear, light wind Water Temperature: 15.0 C (59 F)
Rainfall in the past 48 hours*: 4mm (0.16") Dissolved Oxygen: 8.5 mg/L

Saturday May 15, 2010 :: 6:30AM

Waterplace Park, Providence

Data Collected by: Douglas Stephens

Weather: clear, gentle wind Water Temperature: 15.0 C (59 F)
Rainfall in the past 48 hours*: 4mm (0.16") Dissolved Oxygen: 8.1 mg/L
Tide: flood Salinity: 1.0 ppt

Saturday May 29, 2010 :: 7:00AM

Greystone Pond, Johnston - N. Providence

Data Collected by: Joe Jamroz

Weather: clear, gentle wind Water Temperature: 20.1 C (68.2 F)
Rainfall in the past 48 hours*: none Dissolved Oxygen: 4.0 mg/L

Saturday May 29, 2010 :: 7:30AM

Waterplace Park, Providence

Data Collected by: Matthew and Joanne Carey

Weather: clear, calm wind Water Temperature: 20.0 C (68 F)
Rainfall in the past 48 hours*: none Dissolved Oxygen: 7.1 mg/L
Tide: flood Salinity: 0.8 ppt

Saturday June 12, 2010 :: 7:15AM

Greystone Pond, Johnston - N. Providence

Data Collected by: Emily and Kara Papazian

Weather: heavy overcast, calm wind Water Temperature: 19.0 C (66.2 F)
Rainfall in the past 48 hours*: 5mm (0.2") Dissolved Oxygen: 4.5 mg/L

Sunday June 13, 2010 :: 7:45AM

Donigian Park, Providence

Data Collected by: Beth Faria

Weather: heavy overcast, light wind Water Temperature: 19.0 C (66.2 F)
Rainfall in the past 48 hours*: 39mm (1.54") Dissolved Oxygen: 8.1 mg/L

Saturday June 12, 2010 :: 8:00AM

Waterplace Park, Providence

Data Collected by: Matthew and Joanne Carey

Weather: light overcast, calm wind Water Temperature: 18.0 C (64.4 F)
Rainfall in the past 48 hours*: 5mm (0.2") Dissolved Oxygen: 5.9 mg/L
Tide: high Salinity: 2.2 ppt

Saturday June 19, 2010 :: 7:05AM

Greystone Pond, Johnston - N. Providence

Data Collected by: Emily and Kara Papazian

Weather: clear, light wind Water Temperature: 21.6 C (70.9 F)
Rainfall in the past 48 hours*: none Dissolved Oxygen: 4.0 mg/L

Saturday June 19, 2010 :: 7:50AM

Donigian Park, Providence

Data Collected by: Beth Faria

Weather: clear Water Temperature: 21.5 C (70.7 F)
Rainfall in the past 48 hours*: none Dissolved Oxygen: 6.5 mg/L

Saturday June 19, 2010 :: 6:30AM

Waterplace Park, Providence

Data Collected by: Douglas Stephens

Weather: clear, gentle wind Water Temperature: 21.0 C (69.8 F)
Rainfall in the past 48 hours*: none Dissolved Oxygen: 4.4 mg/L
Tide: ebb Salinity: 7.2 ppt

Saturday July 3, 2010 :: 7:00AM

Greystone Pond, Johnston - N. Providence

Data Collected by: Emily and Kara Papazian

Weather: clear, light wind Water Temperature: 21.0 C (69.8 F)
Rainfall in the past 48 hours*: none Dissolved Oxygen: 4.6 mg/L

Saturday July 3, 2010 :: 7:50AM

Donigian Park, Providence

Data Collected by: Beth Faria

Weather: clear, light wind Water Temperature: 23.0 C (73.4 F)
Rainfall in the past 48 hours*: none Dissolved Oxygen: 5.9 mg/L

Saturday July 3, 2010 :: 6:15AM

Waterplace Park, Providence

Data Collected by: Douglas Stephens

Weather: clear, light wind Water Temperature: 22.0 C (71.6 F)
Rainfall in the past 48 hours*: none Dissolved Oxygen: 2.9 mg/L
Tide: low Salinity: 4.6 ppt

Friday July 16, 2010 :: 7:00AM

Greystone Pond, Johnston - N. Providence

Data Collected by: Joe Jamroz

Weather: light overcast, calm wind Water Temperature: 20.1 C (68.2 F)
Rainfall in the past 48 hours*: 30mm (1.18") Dissolved Oxygen: 3.8 mg/L

Saturday July 17, 2010 :: 6:10AM

Waterplace Park, Providence

Data Collected by: Douglas Stephens

Weather: clear, light wind Water Temperature: 25.0 C (77 F)
Rainfall in the past 48 hours*: none Dissolved Oxygen: 5.6 mg/L
Tide: low Salinity: 2.4 ppt

Monday August 2, 2010 :: 7:50AM

Greystone Pond, Johnston - N. Providence

Data Collected by: Joe Jamroz

Weather: clear, calm wind Water Temperature: 21.2 C (70.2 F)
Rainfall in the past 48 hours*: none Dissolved Oxygen: 4.4 mg/L

Saturday July 31, 2010 :: 8:00AM

Donigian Park, Providence

Data Collected by: Beth Faria

Weather: light overcast, calm wind Water Temperature: 24.0 C (75.2 F)
Rainfall in the past 48 hours*: none Dissolved Oxygen: 5.7 mg/L

Saturday July 31, 2010 :: 8:00AM

Waterplace Park, Providence

Data Collected by: Matthew and Joanne Carey

Weather: light overcast, calm wind Water Temperature: 21.0 C (69.8 F)
Rainfall in the past 48 hours*: none Dissolved Oxygen: 6.4 mg/L
Tide: flood Salinity: 8.1 ppt

Saturday August 14, 2010 :: 6:50AM

Greystone Pond, Johnston - N. Providence

Data Collected by: Joe Jamroz

Weather: clear, calm wind Water Temperature: 21.4 C (70.5 F)
Rainfall in the past 48 hours*: none Dissolved Oxygen: 5.4 mg/L

Saturday August 14, 2010 :: 7:15AM

Donigian Park, Providence

Data Collected by: Bruce Hooke

Weather: clear, light wind Water Temperature: 21.0 C (69.8 F)
Rainfall in the past 48 hours*: none Dissolved Oxygen: 6.9 mg/L
Air Temperature: 18.0 C (64.4 F)

Notes: Today is my first day of monitoring. Up until now, Beth has been monitoring at this site but she has moved away.

It is a beautiful morning! Clear, blue skies and a coolness to the air that hints of the coming fall.

Saturday August 14, 2010 :: 7:30AM

Waterplace Park, Providence

Data Collected by: Matthew and Joanne Carey

Weather: clear, calm wind Water Temperature:
Rainfall in the past 48 hours*: none Dissolved Oxygen: 8.2 mg/L

Saturday August 28, 2010 :: 7:15AM

Greystone Pond, Johnston - N. Providence

Data Collected by: Emily and Kara Papazian

Weather: clear, calm wind Water Temperature: 20.1 C (68.2 F)
Rainfall in the past 48 hours*: none Dissolved Oxygen: 4.8 mg/L

Saturday August 28, 2010 :: 6:40AM

Donigian Park, Providence

Data Collected by: Bruce Hooke

Weather: clear, calm wind Water Temperature: 19.5 C (67.1 F)
Rainfall in the past 48 hours*: none Dissolved Oxygen: 7.6 mg/L
Air Temperature: 13.0 C (55.4 F)

Notes: What a glorious morning! The sun is just climbing up over the trees and the blue in the sky has the crispness of a fall day. I can't see my breath but it feels like I should be able to, but maybe that is just because my body is used to the summer heat so a morning that would have felt warm three months ago feels cool today.

Saturday August 28, 2010 :: 7:45AM

Waterplace Park, Providence

Data Collected by: Matthew and Joanne Carey

Weather: clear, calm wind Water Temperature: 19.0 C (66.2 F)
Rainfall in the past 48 hours*: none Dissolved Oxygen: 6.2 mg/L
Tide: flood Salinity: 1.8 ppt

Saturday September 11, 2010 :: 7:05AM

Greystone Pond, Johnston - N. Providence

Data Collected by: Emily and Kara Papazian

Weather: clear, calm wind Water Temperature: 18.4 C (65.1 F)
Rainfall in the past 48 hours*: none Dissolved Oxygen: 5.2 mg/L

Thursday September 16, 2010 :: 7:30AM

Donigian Park, Providence

Data Collected by: Bruce Hooke

Weather: clear, calm wind Water Temperature: 15.5 C (59.9 F)
Rainfall in the past 48 hours*: none Dissolved Oxygen: 7.9 mg/L
Air Temperature: 11.0 C (51.8 F)

Notes: The river is still at late summer low water levels but the air (and water) temperatures are definitely saying that fall is here. The sky is blue overhead but clouds to the northeast warn of approaching wet weather.

Saturday September 11, 2010 :: 7:45AM

Waterplace Park, Providence

Data Collected by: Matthew and Joanne Carey

Weather: clear, calm wind Water Temperature: 24.0 C (75.2 F)
Rainfall in the past 48 hours*: none Dissolved Oxygen: 5.6 mg/L
Tide: flood Salinity: 6.9 ppt

Saturday October 9, 2010 :: 7:15AM

Greystone Pond, Johnston - N. Providence

Data Collected by: Joe Jamroz

Weather: clear, moderate wind Water Temperature: 15.5 C (59.9 F)
Rainfall in the past 48 hours*: none Dissolved Oxygen: 6.4 mg/L

Saturday October 9, 2010 :: 6:30AM

Donigian Park, Providence

Data Collected by: Bruce Hooke

Weather: clear, calm wind Water Temperature: 15.0 C (59 F)
Rainfall in the past 48 hours*: none Dissolved Oxygen: 8.8 mg/L
Air Temperature: 10.0 C (50 F)

Notes: The last stars were fading out when I got to the site. Fall is definitely here. Sunrise is getting later and later, and both the water and the air have a definite chill to them, but the sky is turning to gold in the east and it promises to be a beautiful day.

Saturday October 9, 2010 :: 6:40AM

Waterplace Park, Providence

Data Collected by: Douglas Stephens

Weather: clear, light wind Water Temperature: 15.0 C (59 F)
Rainfall in the past 48 hours*: none Dissolved Oxygen: 7.7 mg/L
Tide: flood Salinity: 1.6 ppt

Friday October 15, 2010 :: 7:15AM

Greystone Pond, Johnston - N. Providence

Data Collected by: Joe Jamroz

Weather: heavy overcast, strong wind Water Temperature: 13.4 C (56.1 F)
Rainfall in the past 48 hours*: 38mm (1.5") Dissolved Oxygen: 7.8 mg/L

Friday October 15, 2010 :: 6:45AM

Donigian Park, Providence

Data Collected by: Bruce Hooke

Weather: heavy overcast, moderate wind Water Temperature: 13.0 C (55.4 F)
Rainfall in the past 48 hours*: 38mm (1.5") Dissolved Oxygen: 9.3 mg/L
Air Temperature: 9.5 C (49.1 F)

Notes: A wild morning on which to end the monitoring season on the Woonasquatucket River and also end my "career" as a water quality monitor here. The river is running high, hard and muddy from last night's rain produced by a fall nor'easter that is also generating a cold, blustery wind, but as I was packing up my gear and getting ready to leave the river blue skies started to break through.

Saturday October 16, 2010 :: 6:40AM

Waterplace Park, Providence

Data Collected by: Douglas Stephens

Weather: clear, strong wind Water Temperature: 12.0 C (53.6 F)
Rainfall in the past 48 hours*: 38mm (1.5") Dissolved Oxygen: 8.6 mg/L
Tide: ebb

* Note: Rainfall amounts are recorded at a rain gauge in western Providence or at other rain gauges in the area. These rainfall amounts should be view as approximations.

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