Nutrient samples were collected from seven river stations on April 17th and eight bay stations on April 16th. In the five days prior to sampling, there were 1.04 inches of precipitation recorded at T.F. Green.
Among the river stations sampled, the highest total nitrogen (TN), and dissolved inorganic nitrogen (DIN) concentrations were observed at Blackstone River @ Slater Mill (TN = 751 ppb, DIN = 571 ppb). The highest total dissolved nitrogen (TDN) was observed at Blackstone River @ Bikepath Bridge (TDN = 787 ppb). The lowest TN, TDN, and DIN were observed at Moshassuck River @ Higginson Ave. (TN = 483.5 ppb, TDN = 489 ppb, DIN = 291 ppb, all averaged with duplicates).
Among the bay stations sampled, the highest surface TN, TDN, and DIN were observed at Phillipsdale Landing Surface (TN = 844 ppb, TDN = 678, and DIN = 545 ppb). The lowest surface TN were at Pawtuxet Cove (TN = 633 ppb). The lowest surface TDN were observed at Bullock Reach Buoy (TDN = 402 ppb, average of duplicates). The lowest surface DIN were observed at Conimicut Point Surface (DIN = 301 ppb). Chlorophyll a concentrations at the surface bay stations averaged 2.39 μg/L overall with a maximum of 3.35 μg/L at the Conimicut Point.
The next scheduled sampling date is May 1, 2024.