Nutrients Sampling

Nutrient samples were collected from seven river stations and seven bay stations on April 29^th. 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 12^th, 2026.​

Nutrient samples were collected from thirteen river stations and eight bay stations on April 15^th. All bay stations were sampled at the surface, and Edgewood Shoal was sampled at the surface and bottom. In the five days prior to sampling, 0.03” of precipitation were 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 Ten Mile River @ Central Ave (TN = 1,680 ppb, TDN = 1,680 ppb, DIN = 1,388.7 ppb). The lowest TN and TDN were observed at Moshassuck River @ Higginson Ave (TN = 426 ppb, TDN = 416 ppb). The lowest DIN was observed at Coles River @ Milford Rd (149 ppb).

Among the bay stations sampled, the highest surface TN and TDN were observed at Phillipsdale Landing (TN = 1,024 ppb, TDN = 975.5 ppb, average of duplicates). The highest DIN was observed at Pawtuxet Cove (729.8 ppb). The lowest surface TN and TDN were observed at Conimicut Point (TN = 474 ppb, TDN = 168 ppb). The lowest surface DIN was observed at Conimicut Point and Bullock Reach Buoy (13 ppb, reflecting minimum detection limits for DIN).

The next scheduled sampling date is April 29^th, 2026.​

Nutrient samples were collected from fourteen river stations on April 1^st. In the five days prior to sampling, 0.08” of precipitation were 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 Ten Mile River @ Central Ave (TN = 1,790 ppb, TDN = 2,240 ppb, DIN = 1,608 ppb). The lowest TN, TDN, and DIN were observed at Coles River @ Milford Rd (TN = 602 ppb, TDN = 574 ppb, DIN = 215.3 ppb).

The next scheduled sampling date is April 15^th, 2026.​

Nutrient samples were collected from seven river stations and seven bay stations on March 18^th.  In the five days prior to sampling, 1.75” of precipitation were 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 @ Slater Mill (TN = 902 ppb, TDN = 1,210 ppb, DIN = 559 ppb). The lowest TN, TDN and DIN were observed at Pawtuxet River @ Broad St. (TN = 759 ppb, TDN = 657 ppb DIN = 461 ppb).

Among the bay stations sampled, the lowest TN, TDN and DIN were observed Phillipsdale Landing Surface (TN = 999 ppb, TDN = 981 ppb, DIN = 693 ppb). The lowest TN, TDN and DIN were observed at Bullock’s Reach Bottom (TN = 429 ppb, TDN = < 100 ppb DIN = 8.75 ppb).

The next scheduled sampling date is April 1^st, 2026.

Nutrient samples were collected from nine river stations on March 4^th.  In the five days prior to sampling, 0.72” of precipitation were 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 Ten Mile River @ Roger Williams Ave. (TN = 2,550 ppb, TDN = 2,570 ppb, DIN = 2,309.4 ppb). The lowest TN and DIN were observed at Moshassuck River @ Higginson Ave. (TN = 615 ppb, DIN = 509.8 ppb), while the lowest TDN was observed at Moshassuck River @ Footbridge at Mill St. (TDN = 834 ppb).

The next scheduled sampling date is March 18^th, 2026.

Nutrient samples were collected from six river stations on February 18th.  In the five days prior to sampling, 0.25” of precipitation were 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 @ Slater Mill (TN = 1,430 ppb, TDN = 2,170 ppb, DIN = 1,249.2 ppb). The lowest TN, TDN, and DIN were observed at Moshassuck River @ Higginson Ave. (TN = 710 ppb, TDN = 702 ppb, DIN = 595.9 ppb).

The next scheduled sampling date is March 4th, 2026.

Nutrient samples were collected from nine river stations on February 4th.  In the five days prior to sampling, 0.0” of precipitation were 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 Ten Mile River @ Roger Williams Ave. (TN = 3,530 ppb, TDN = 3,510 ppb, DIN = 3,336 ppb). The lowest TN, TDN, and DIN were observed at Coles River @ Milford Rd. (TN = 830 ppb, TDN = 938 ppb, DIN = 731 ppb).

The next scheduled sampling date is February 18th, 2026.

Nutrient samples were collected from seven river stations on January 21st.  In the five days prior to sampling, 0.7” of precipitation were 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 Pawtuxet River @ Broad St. (TN = 1,710 ppb, TDN = 1,710 ppb, DIN = 1,519.5 ppb). The lowest TN, TDN, and DIN were observed at Moshassuck River @ Footbridge at Mill St. (TN = 563 ppb, TDN = 572 ppb, DIN = 424.3 ppb).

The next scheduled sampling date is February 4th, 2026.

Nutrient samples were collected from thirteen river stations on January 7th.  In the five days prior to sampling, 0.11” of precipitation were 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 Pawtuxet River @ Broad St. (TN = 2,160 ppb, TDN = 2,330 ppb, DIN = 1,234.2 ppb). The lowest TN, TDN, and DIN were observed at Woonasquatucket River @ Manton Ave. Bridge (TN = 808 ppb, TDN = 910 ppb, DIN = 655.9 ppb).

The next scheduled sampling date is January 21st, 2026.

Nutrient samples were collected from seven river stations on December 24^th.  In the five days prior to sampling, 0.77” of precipitation were 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 Pawtuxet River @ Broad St. TN = 1,670 ppb, TDN = 1,700 ppb, DIN = 1,567.1 ppb). The lowest TN, TDN, and DIN were observed at Moshassuck River @ Higginson Ave. (TN = 563 ppb, TDN = 572 ppb, DIN = 424.3 ppb).

The next scheduled sampling date is January 7^th, 2026.