April 3, 2024
Nutrients Sampling
Nutrient samples were collected from thirteen river stations on April 3rd. In the five days prior to sampling, there were 1.44 inches of precipitation 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 Ten Mile River @ Central Ave. (TN = 1,120 ppb, TDN = 1,150 ppb, DIN = 866 ppb). The lowest TN, TDN, and DIN were observed at Coles River @ Milford Road (TN = 531 ppb, TDN = 494 ppb, DIN = 130 ppb).
The next scheduled sampling date is April 17, 2024.
March 20, 2024
Nutrients Sampling
Nutrient samples were collected from seven river stations and eight bay stations on March 20th. All bay stations were sampled at the surface and bottom. In the five days prior to sampling, there were 0.2 inches of precipitation recorded at T.F. Green.
Among the river stations sampled, the highest total nitrogen (TN) and total dissolved nitrogen (TDN) were observed at Blackstone River @ Bikepath Bridge (TN=906 ppb, TDN = 928 ppb), while the highest dissolved inorganic nitrogen (DIN) was at the Blackstone River @ Slater Mill (DIN=735 ppb). The lowest TN, TDN, and DIN were observed at Moshassuck River @ Higginson Ave (TN=559.5 ppb, TDN=567.5 ppb, DIN=401 ppb, all averaged with duplicates).
Among the bay stations sampled, the highest surface TN, TDN, and DIN were observed at Phillipsdale Landing (TN = 1,080 ppb, TDN = 961 ppb, DIN = 765 ppb). The lowest surface TN, TDN, and DIN were observed at the Bullock Reach Buoy (TN = 460 ppb, TDN = 177 ppb, DIN = 73 ppb). Chlorophyll a concentrations at the surface bay stations averaged 6.22 μg/L overall with a maximum of 15.01 μg/L at the Bullock Reach Buoy.
The next scheduled sampling date is April 3, 2024.
March 6, 2024
Nutrients Sampling
Nutrient samples were collected from fourteen river stations and eight bay stations on March 6th. 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, there were 3.16 inches of precipitation 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 Ten Mile River @ Central Ave. (TN = 1,500 ppb, TDN = 1,460 ppb, DIN = 1,304 ppb). The lowest TN, TDN, and DIN were observed at Coles River @ Milford Road (TN = 512 ppb, TDN = 462 ppb, DIN = 166 ppb).
Among the bay stations sampled, the highest surface TN, TDN, and DIN were observed at Phillipsdale Landing (TN = 1,250 ppb, TDN = 929 ppb, DIN=786 ppb). The lowest surface TN, TDN, and DIN were observed at Conimicut Point (TN = 786 ppb, TDN = 389 ppb, DIN=315 ppb. Chlorophyll a concentrations at the surface bay stations averaged 1.90 μg/L overall with a maximum of 4.83 μg/L at the Bullock Reach Buoy.
The next scheduled sampling date is March 20, 2024.
August 28, 2024
Water Column Clarity
Water clarity was measured at seven locations in the Providence River and Seekonk River estuaries on August 28, 2024. Rainfall totaling 0.38 inches was recorded at TF Green in the five days prior to the survey. Secchi depth averaged 1.8 meters. The lowest clarity this week (1.4 meters) was measured at Phillipsdale Landing, while the greatest clarity (2.1 meters) was measured at Bullock Reach Buoy. There was a general north-to-south gradient of increasing water clarity among the sites this week.
August 21, 2024
Water Column Clarity
Water clarity was measured at eight locations in the Providence River and Seekonk River estuaries on August 21, 2024. Rainfall totaling 0.59 inches was recorded at TF Green in the five days prior to the survey. Secchi depth averaged 1.7 meters. The lowest clarity this week (1.5 meters) was measured at Bullock Reach Buoy, while the greatest clarity (1.8 meters) was measured at Phillipsdale Landing and India Point Park. There was no evidence of a north-to-south gradient of increasing water clarity among the sites this week.
