Historical News

Week of December 12 – 18, 2021

Water Column Profiles

​Water column profiles were at seven locations in the Providence River using a Seabird profiling instrument on December 15, 2021. Conditions leading up to sampling were mostly dry, with 0.26 inches of precipitation recorded at T.F. Green. Evidence of density stratification was observed at four locations: Bullock Reach Buoy, Conimicut Point West, Edgewood Shoals, and Edgewood Yacht Club.  

Surface salinities among all sites ranged from 22.3 PSU at Edgewood Shoals to 28.3 PSU at Pomham Rocks. Bottom salinities ranged from 27.2 PSU at Pawtuxet Cove to 29.6 PSU at Conimicut Point West. The warmest water temperatures (8.7°C) at the surface were observed at Edgewood Yacht Club, while the warmest bottom temperatures (9.0 °C) were observed at India Point Park. The lowest surface temperatures (7.2 °C) were observed at Conimicut Point, while the lowest bottom temperatures (8.4°C) were observed at two locations: Conimicut Point and Pawtuxet Cove.

This week, hypoxic conditions (dissolved oxygen (DO) concentrations <2.9 mg/L) was not observed at any site. Across all sites, DO ranged from 8.9 mg/L in the bottom waters of India Point Park to 10.3 mg/L at the surface of both Bullock Reach Buoy and Conimicut Point. Please note that due to quality control issue, numerical fluorescence data are not posted at this time. ​


Week of January 9 – January 15, 2022

Surface Mapping

​Data were collected on January 13, 2022, while the R/V Monitor was underway collecting nutrient samples in the Providence River estuary. The average chlorophyll concentrations were good in the areas surveyed. From north to south, average chlorophyll concentrations were as follows: Upper Providence River (1.10 µg/L), Edgewood Shoals area (1.37 µg/L), Pawtuxet River area (1.03 µg/L), and Lower Providence River (0.69 µg/L). Overall, chlorophyll ranged between 0.19 µg/L and 2.78 µg/L with an overall average of 0.98 µg/L. The chlorophyll data from this date are presented in the map below:

Dataflow 2022-01-13 small.jpg

Week of January 2 – January 8, 2022

Surface Mapping

​Data were collected on January 6, 2022, while the R/V Monitor was underway collecting bacteria samples in the Seekonk and Providence River estuaries. The average chlorophyll concentrations were good in the areas surveyed. From north to south, average chlorophyll concentrations were as follows: Seekonk River (0.64 µg/L), Upper Providence River (1.02 µg/L), Edgewood Shoals area (0.96 µg/L), Pawtuxet River area (0.59 µg/L), and Lower Providence River (0.58 µg/L). Overall, chlorophyll ranged between 0.27 µg/L and 4.09 µg/L with an overall average of 0.74 µg/L. The chlorophyll data from this date are presented in the map below:​

Dataflow 2022-01-06 small.jpg

Week of January 9 - 15, 2022

R/V Monitor's Blog

​On Thursday, January 13th, the crew of the R/V Monitor was out on the upper Bay collecting nutrients samples, taking Secchi Disk and Par sensor water clarity measurements, and conducting real-time surface mapping of water quality parameters, including dissolved oxygen, chlorophyll, water temperature, salinity, and pH, all in an effort to document water quality improvements associated with NBC construction projects. Jeff captained the boat while monitoring professionals Justin, Amanda and Tyler collected the samples and data. It was a partly sunny day with calm and mild conditions. Staff spotted some seals but were unable to photograph them. Today's photo features a cargo ship being pushed by a tug boat on the upper Bay.

Cargo Ship 1-13-22.jpg 

Week of December 19 – 25, 2021

Bacteria Sampling

​On December 22, twenty stations were sampled for fecal coliform bacteria in the Providence and Seekonk Rivers. Five of these stations were also sampled for enterococci bacteria. Precipitation in the five days prior to sampling totaled 0.22 inches at T.F. Green.

Geometric mean of fecal coliform results for all sites was 38 MPN/100 mL, with Seekonk River sites having higher counts than Providence River sites (geometric means of 67 and 29 MPN/100 mL, respectively). The maximum count (390 MPN/100 mL) was measured at Collier Point Park in the Providence River. Overall, fecal coliform results from the Seekonk River exceeded both state shellfishing and primary contact standards. Fecal coliform results from the Providence River also exceed state shellfishing standards, but results were within state primary contact standards for the Providence River. 

Enterococci results this week were slightly lower compared to the previous sampling event, with an overall geometric mean of 22 MPN/100 mL. Enterococci results at all sites ranged from non-detect at two sites (South Field's Point East & Conimicut Point) to 369 MPN/100 mL at Point St. Bridge site. Overall, enterococci results exceeded state primary contact standards due to high overall counts in both the Seekonk and Providence Rivers.

Please note: the results of NBC's fecal coliform and enterococci monitoring are for informational/research purposes only and are not to intended to suggest official state compliance with bathing or shellfishing standards.​


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