Week of October 17 - 23, 2021
Nutrients Sampling
Nutrient samples were collected from seven local river stations and five bay stations (surface and bottom) on October 20, 2021. Bay sampling remains limited due to mechanical problems with the NBC’s research vessel, R/V Monitor. Weather conditions leading up to the sampling day included two days with moderate rainfall, totaling 0.34 inches, three and four days prior to sampling.
Among the river stations sampled, the highest total nitrogen (TN) and dissolved inorganic nitrogen (DIN) results occurred at the Pawtuxet River at Broad St. At this site, TN measured 1,240 ppb while DIN measured 904.6 ppb. The highest total dissolved nitrogen (TDN) occurred at the Ten Mile River at Roger Williams Ave., at 1,200 ppb. The lowest nitrogen levels occurred at the Moshassuck River at Higginson Ave., at 515 ppb (TN), 506 ppb TDN, and 304.5 ppb DIN.
Among the Bay sites, Pawtuxet Cove had the highest nitrogen, at 1,030 ppb TN, 959 ppb TDN, and 675 ppb DIN. The lowest TN (484 ppb) and DIN (183.5 ppb) occurred at Edgewood Shoal, while the lowest TDN (320 ppb) occurred at Edgewood Yacht Club.
Results from nutrient sampling on November 2, 3, and 17 are pending analysis. The next scheduled sample date is December 1.
Week of October 10 - 16, 2021
Nutrients Sampling
Nutrient samples were collected from the Bullock Reach Buoy bay site, surface and bottom, on October 13. Bay sampling remains limited due to mechanical problems with the NBC’s research vessel, R/V Monitor. Weather conditions leading up to the sampling day were dry, with no recorded rainfall in the five days prior to sampling.
Total nitrogen (TN) at the Bullock Reach surface measured 583 ppb. Total dissolved nitrogen (TDN) and dissolved inorganic nitrogen (DIN) measured 394 ppb and 247.4 ppb, respectively.
Results from nutrient sampling on October 20 are pending analysis. The next scheduled sample date is November 3.
Week of October 3 - 9, 2021
Nutrients Sampling
Nutrient samples were collected from fourteen local and border river stations and one bay station (Phillipsdale Landing) on October 6, 2021. An additional bay station (Pawtuxet Cove) was sampled on October 7, 2021 in response to reports of a fish kill in the area. Both bay sites were sampled at the surface and bottom. Bay sampling remains limited due to mechanical problems with the NBC’s research vessel, R/V Monitor. Weather conditions leading up to the sampling day were wet, with 1.67 inches of recorded rainfall in the three days prior to sampling.
Among the river stations sampled, the highest total nitrogen (TN) and total dissolved nitrogen (TDN) results occurred at the Ten Mile River at Roger Williams Ave. At this site, TN measured 1,170 ppb while TDN measured 1,190 ppb. The highest dissolved inorganic nitrogen (DIN) occurred at the Pawtuxet River at Broad St., at 856 ppb. The lowest TN (458 ppb) and TDN (408 ppb) were observed at the Moshassuck River at Higginson Avenue, while the lowest DIN (164.8 ppb) occurred at Coles River at Milford Road.
Among the Bay sites sampled this week, Pawtuxet Cove had the highest nitrogen, at 1,120 ppb TN, 1,010 ppb TDN, and 772 ppb DIN. Phillipsdale Landing nitrogen concentrations were lower, at 879 ppb TN, 731 ppb TDN, and 505 ppb DIN. As noted above, Pawtuxet Cove was sampled the day after Phillipsdale Landing and the river sites.
Results from nutrient sampling on October 13 and 20 are pending analysis. The next scheduled sample date is November 3.
Week of December 12 – December 18, 2021
Surface Mapping
Data
were collected on December 15, 2021, 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 (0.68 µg/L),
Edgewood Shoals area (0.93 µg/L), Pawtuxet River area (0.62 µg/L), and Lower
Providence River (0.46 µg/L). Overall, chlorophyll ranged between 0.08 µg/L and
2.06 µg/L with an overall average of 0.67 µg/L. The chlorophyll data from this
date are presented in the map below:
Week of December 5 – December 11, 2021
Surface Mapping
Data
were collected on December 8, 2021, 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 (1.69
µg/L), Upper Providence River (2.24 µg/L), Edgewood Shoals area (1.84 µg/L), Pawtuxet
River area (1.91 µg/L), and Lower Providence River (1.61 µg/L). Overall,
chlorophyll ranged between 1.08 µg/L and 4.42 µg/L with an overall average of 1.82
µg/L. The chlorophyll data from this date are presented in the map below:
