Historical News

Week of April 7 - 13, 2019

Water Column Profiles

Water column profiles were measured at six sites in the Seekonk and Providence Rivers on April 10, 2019. In the two days prior to sampling, approximately 1 inch of precipitation was recorded. Some degree of water column stratification was present at most sites; Bullock’s Reach exhibited the greatest degree of mixing.

Lowest water column salinity was recorded at Pawtuxet Cove, with readings of 5.3 psu in surface waters and 25.9 psu at depth. Highest salinity in surface waters (23.1 psu) was measured at Bullock Reach, while highest salinity at depth (30.2 psu) was observed at Conimicut Point. Water column temperatures were highest at Pawtuxet Cove; surface water temperature was 10.1°C and bottom water temperature was 8.1°C. The lowest surface water temperature (8.7°C) was measured at Bullock Reach, while the lowest water temperature at depth (6.2°C) occurred at India Point Park.

Hypoxic conditions (dissolved oxygen <2.9 mg/L) were not present at any of the sites sampled. Dissolved oxygen ranged from 8.89 mg/L at depth at India Point Park to 12 mg/L in surface waters of Pawtuxet Cove. Fluorescence averaged 2.7 mg/m3 at all sites, and the maximum fluorescence, 7.0 mg/m3, was observed at India Point Park.

Week of April 14 - 20, 2019

R/V Monitor's Blog

​On Wednesday, April 17th, the crew of the R/V Monitor was out on the upper Bay collecting bacteria samples in an effort to document water quality improvements associated with NBC construction projects.  Water clarity measurements, water column profiles, and real-time surface mapping of water quality parameters were not done this day due to time constraints and equipment issues.  Jeff captained the boat while monitoring professionals Sara, Amanda and Michael collected the samples and data.  It was a sunny and cool day with a calm wind, and slightly choppy waters.  The featured photo was taken at the Community Boating Center at India Point Park.

 4-17-19 Community Boating Ctr.jpg

Week of February 24 – March 2, 2019

Nutrients Sampling

​Fourteen river stations were sampled for nutrients on February 27, 2019. Three days prior to sampling, 0.87 inches of rainfall occurred. Highest total nitrogen (TN), total dissolved nitrogen (TDN), and dissolved inorganic nitrogen (DIN) occurred at the Ten Mile River at Central Avenue site, with concentrations of 1940 ppb, 1940 ppb, and 1792 ppb, respectively. Lowest nitrogen concentrations were measured at the Coles River at Milford Street site; TN was 588 ppb, TDN was 434 ppb, and DIN was 241 ppb.  Results from nutrient sampling completed on March 13, March 27, and April 10 are pending final analysis. The next anticipated date of sampling is April 24, 2019.

Week of March 24 - 30, 2019

Water Column Profiles

Water column profiles were measured at eight sites in the Seekonk and Providence River estuaries on March 27, 2019. Substantial rainfall of 0.98 inches was recorded in the area five to six days prior to sampling, contributing to a low salinity surface layer observed at Pawtuxet Cove and Phillipsdale Landing, the sites closest to river sources. Salinity at the surface at these sites was around 5-7 psu. Surface salinity at the remaining sites ranged from 21 psu at Bullock Reach to 26 psu at Pomham Rocks. Bottom salinity was lowest at Phillipsdale, at 26.5 psu, compared to a maximum bottom salinity of 30 psu at Bullock Reach and Conimicut Point. Some stratification of salinity and/or temperatures was observed at most sites. 

Surface temperatures were warmer than the previous survey, ranging from 4.9°C at Conimicut Point to 6.7°C at Phillipsdale; bottom temperatures were around 5°C at all sites. Dissolved oxygen (DO) levels were high, remaining well above the hypoxia threshold of 2.9 mg/L; the minimum DO of 10.0 mg/L was measured in the bottom waters of Conimicut Point. Lastly, the maximum fluorescence result was observed at 3 m depth at Edgewood Shoal, at 5.1 mg/m3.


Week of March 10 - 16, 2019

Water Column Profiles

​Water column profiles were measured at six sites in the Seekonk and Providence River estuaries on March 13, 2019. Moderate rainfall of 0.64 inches was recorded in the area three days prior to sampling, and continued snowmelt contributed to a low salinity surface layer observed at Pawtuxet Cove, the site closest to a river source. Salinity at the surface at this site was around 6 psu. Surface salinity at the remaining five sites ranged from 22 psu to 25 psu. Bottom salinity was also lowest at Pawtuxet Cove, at 26 psu, compared to a maximum bottom salinity of 30 psu at Bullock Reach and Conimicut Point. Density stratification related to temperature and salinity was observed at most sites. The maximum water temperature this week was 5.6°C at the surface at India Point Park, while the minimum of 3.5°C was observed at the bottom at India Point Park and near-surface at Conimicut Point and Bullock Reach. Dissolved oxygen (DO) levels were high at all sites, remaining well above the hypoxia threshold of 2.9 mg/L; the minimum DO of 9.3 mg/L was measured in the bottom waters of Bullock Reach. Unfortunately, fluorescence data collected this week appeared suspect and were deemed non-reportable.​

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