Nutrient samples were collected from 14 river stations and nine bay stations on June 28th. Edgewood Shoal was sampled at the surface and bottom; all other bay stations were sampled at the surface only. In the five days prior to sampling and the morning of, there were 1.51 inches of rainfall recorded at T.F. Green.
Among the river stations sampled, the highest total nitrogen (TN) concentration was observed at Warren Reservoir/Kickemuit River (1,590 ppb), while the highest total dissolved nitrogen (TDN) and dissolved inorganic nitrogen (DIN) concentrations were observed at Ten Mile River @ Central Ave. (TDN = 1,310 ppb, DIN = 970 ppb). The lowest TN and TDN was observed at Moshassuck River @ Higginson Ave. (TN = 505 ppb, TDN = 479 ppb, average of duplicates), while the lowest DIN was at Coles River @ Milford Rd. (109 ppb).
Among the bay stations sampled, the highest surface TN, TDN, and DIN concentrations were observed at Phillipsdale Landing (TN = 1,120 ppb, TDN = 772 ppb, DIN = 522 ppb). The lowest surface TN was observed at Conimicut Point (600 ppb), the lowest surface TDN was at Edgewood Yacht Club (206 ppb), and the lowest surface DIN was at Pomham Rocks (14.8 ppb). Chlorophyll a concentrations at the surface bay stations were relatively low at most sites but elevated at Edgewood Yacht Club, Pomham Rocks, and India Point Park; concentrations averaged 12.34 μg/L overall with a maximum of 22.3 μg/L at Edgewood Yacht Club.
The next scheduled sampling date is July 12, 2023.