Nutrient samples were collected from eight local river stations, and seven bay stations on April 19, 2023. All bay stations were sampled at surface and bottom. In the five days prior to sampling, there was 0.17 inches of 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) were observed at Blackstone River at Stateline. The TN, TDN, DIN were 1,210 ppb, 1,220 ppb, and 951.4 ppb, respectively. The lowest TN, TDN and DIN were observed at the duplicate samples collected at Pawtuxet River at Broad Street. The TN, TDN and DIN averaged 535 ppb, 246.5 ppb, and 66.7 ppb, respectively.
Among the bay stations sampled, the highest TN, TDN, and DIN were observed at Ten Mile River at Central Ave. The TN, TDN, DIN were 2,300 ppb, 2,000 ppb, and 1,727 ppb, respectively. Among the bay stations sampled, the highest TN (1,290 ppb), TDN (1,060 ppb), DIN (818.9 ppb) were observed at Phillipsdale Landing. The lowest surface TN (378 ppb) and TDN (129 ppb) were observed at Conimicut Point. The lowest surface DIN (13 ppb) was observed at Bulluck Reach Buoy. Chlorophyll a concentrations at the bay stations increased from the previous sampling event, averaging 10.2 ug/L across all sites. The maximum result (15.17 ug/L) occurred at Bullock Reach Buoy.
Data from additional sampling dates (typically every two weeks) are pending analysis and writeup.