Nutrient samples were collected from seven river stations and seven bay stations on September 6th, 2023. All bay stations were sampled at the surface and bottom. In the five days prior to sampling, there was no rainfall recorded at T.F. Green.
Among the river stations sampled, the highest total nitrogen (TN), total dissolved nitrogen (TDN), and dissolved inorganic nitrogen (DIN) concentrations were observed at Pawtuxet River @ Broad St (TN = 1,560 ppb, TDN = 1,510 ppb, DIN = 1,271.3 ppb). The lowest TN, TDN, and DIN were observed at Moshassuck River @ Higginson Ave. (TN = 539 ppb, TDN = 640 ppb, DIN = 483 ppb).
Among the bay stations sampled, the highest surface TN, TDN, and DIN concentrations were observed at Pawtuxet Cove (TN = 994 ppb, TDN = 799 ppb, DIN = 633.4). The lowest surface TN was observed at the Bullock Reach Buoy (TN = 438 ppb), the lowest surface TDN was observed at Pomham Rocks (TDN = 155 ppb), and lowest surface DIN was at Edgewood Yacht Club (DIN = 20 ppb). Chlorophyll a concentrations at the surface bay stations averaged 4.5 μg/L overall with a maximum of 7.9 μg/L at Conimicut Point.