Nutrient samples were collected from seven river stations and seven bay stations on April 29th. All bay stations were sampled at the surface and bottom. In the five days prior to sampling, trace amounts of precipitation were recorded at T.F. Green.
Among the river stations sampled, the highest total nitrogen (TN), and dissolved inorganic nitrogen (DIN) were observed Pawtuxet River @ Broad St (TN = 1,040 ppb, DIN = 942.2 ppb). The highest total dissolved nitrogen (TDN) was observed at Blackstone River @ Slater Mill (1,750 ppb). However, a significantly higher TDN compared to the TN observed at this site may indicate an issue with the sampling or analysis. The lowest TN, TDN, and DIN were observed at Moshassuck River @ Footbridge at Mill St (TN = 524 ppb, TDN = 573 ppb, DIN = 408.1).
Among the bay stations sampled, the highest surface TN, TDN, and DIN were observed at Pawtuxet Cove (TN = 971 ppb, TDN = 1,260 ppb, DIN = 739.1). The lowest surface TN was observed at Pomham Rocks (359 ppb). The lowest TDN was observed at Conimicut Point, Pomham Rocks, and Bullock Reach Buoy (<100.0 ppb). The lowest surface DIN was observed at Conimicut Point (13 ppb, reflecting minimum detection limits for DIN).
The next scheduled sampling date is May 12th, 2026.