Water Column Profiles

Water column profiles were conducted at seven locations in the Providence and Seekonk River estuaries on August 7, 2024 using a Seabird Electronics profiler. In the five days leading up to the survey, 0.95 inches of precipitation were recorded at T.F. Green. Water column stratification at the sites varied from weakly stratified at Pawtuxet Cove and Edgewood Yacht Club, to strongly stratified at Conimicut Point. 

Dissolved oxygen (DO) conditions were below the hypoxia threshold (2.9 mg/L) in the lower portion of the water column at Edgewood Yacht Club, in the middle and lower portions of the water column at Pomham Rocks, and in all portions of the water column (upper, middle and lower) at India Point Park and Phillipsdale Landing. The highest fluorescence readings for the week were measured around 2 meters below the surface at Edgewood Yacht Club.

Water column profiles were conducted at eight locations in the Providence and Seekonk River estuaries on July 26, 2023 using a Seabird Electronics profiler. In the three days leading up to the survey, there were 0.10 inches of precipitation recorded at T.F. Green. Moderate density stratification was observed at Edgewood Shoal; all other sites still exhibited strong stratification this week.

Dissolved oxygen (DO) conditions were below the hypoxia threshold (2.9 mg/L) in the middle and/or lower half of the water column at all sites surveyed. Fluorescence was moderately elevated at the surface of most sites this week, but relatively low at Phillipsdale Landing and India Point Park.​

Water column profiles were conducted at eight locations in the Providence and Seekonk River estuaries on July 26, 2023 using a Seabird Electronics profiler. In the three days leading up to the survey, there were 0.10 inches of precipitation recorded at T.F. Green. Moderate density stratification was observed at Edgewood Shoal; all other sites still exhibited strong stratification this week.

Dissolved oxygen (DO) conditions were below the hypoxia threshold (2.9 mg/L) in the middle and/or lower half of the water column at all sites surveyed. Fluorescence was moderately elevated at the surface of most sites this week, but relatively low at Phillipsdale Landing and India Point Park.​

Water column profiles were conducted at seven locations in the Providence and Seekonk River estuaries on July 19, 2023 using a Seabird Electronics profiler. In the three days leading up to the survey, there were 3.35 inches of precipitation recorded at T.F. Green. Strong density stratification was observed at all sites surveyed this week.

Dissolved oxygen (DO) conditions were below the hypoxia threshold (2.9 mg/L) in the middle and/or lower half of the water column at all sites surveyed. Fluorescence was moderately elevated at the surface of Conimicut Point West, Edgewood Yacht Club, and Bullock Reach Buoy this week and relatively low at the other sites.

Water column profiles were conducted at seven locations in the Providence and Seekonk River estuaries on July 12, 2023 using a Seabird Electronics profiler. In the three days leading up to the survey, there were 1.91 inches of precipitation recorded at T.F. Green. Strong density stratification was observed at all sites surveyed this week.

Dissolved oxygen (DO) conditions were above the hypoxia threshold (2.9 mg/L) at Conimicut Point West; all other sites surveyed had hypoxic conditions in the middle and/or lower half of the water column. Fluorescence was moderately elevated at the surface of Conimicut Point West this week and relatively low at all other sites.

Water column profiles were conducted at eight locations in the Providence and Seekonk River estuaries on July 5, 2023 using a Seabird Electronics profiler. In the three days leading up to the survey, there were 1.25 inches of precipitation recorded at T.F. Green. Strong density stratification was observed at all sites surveyed this week.

Dissolved oxygen (DO) conditions were above the hypoxia threshold (2.9 mg/L) at Bullock Reach Buoy and Conimicut Point West; all other sites surveyed had hypoxic conditions in the lower half of the water column. Fluorescence was moderately elevated at the surface of Bullock Reach Buoy and Conimicut Point West this week and low at all other sites.​

Water column profiles were conducted at eight locations in the Providence and Seekonk River estuaries on June 28, 2023 using a Seabird Electronics profiler. In the three days leading up to the survey and the morning of, there were 0.92 inches of precipitation recorded at T.F. Green. Strong density stratification was observed at most sites surveyed this week, with Bullock Reach Buoy and Conimicut Point West exhibiting moderate density stratification.

Dissolved oxygen (DO) conditions remained above the hypoxia threshold (2.9 mg/L) at most sites this week but were below the hypoxia threshold in the bottom waters of Phillipsdale Landing (1.01 mg/L) and Edgewood Shoal (0.57 mg/L). Fluorescence was low to moderately elevated this week, with the highest value (32.52 mg/m³) observed at the surface of Phillipsdale Landing.

Water column profiles were conducted at eight locations in the Providence and Seekonk River estuaries on June 21, 2023 using a Seabird Electronics profiler. In the three days leading up to the survey, there was no precipitation recorded at T.F. Green. Density stratification was moderate to strong at the sites surveyed.

Dissolved oxygen (DO) conditions remained above the hypoxia threshold (2.9 mg/L) at most sites this week; the lowest DO observed was approximately 3.76 mg/L near the surface of Phillipsdale Landing. Fluorescence was low to moderately elevated this week, with the highest value (21.44 mg/m³) observed at Pawtuxet Cove.​

Water column profiles were conducted at seven locations in the Providence and Seekonk River estuaries on June 14, 2023 using a Seabird Electronics profiler. In the three days leading up to the survey, there were 0.21 inches of precipitation recorded at T.F. Green. India Point Park exhibited strong density stratification and all other sites were moderately stratified.

Dissolved oxygen (DO) conditions remained above the hypoxia threshold (2.9 mg/L) at all sites this week; the lowest DO observed was approximately 4.05 mg/L in the middle waters of Phillipsdale Landing. Fluorescence was fairly low this week, ranging from 1.28 to 13.38 mg/m³.

Water column profiles were conducted at six locations in the Providence and Seekonk River estuaries on June 7, 2023 using a Seabird Electronics profiler. In the three days leading up to the survey, there were 0.12 inches of precipitation recorded at T.F. Green. Phillipsdale Landing exhibited moderate density stratification and all other sites were weakly stratified.

Dissolved oxygen (DO) conditions remained above the hypoxia threshold (2.9 mg/L) at all sites this week; the lowest DO observed was approximately 4.65 mg/L in the bottom waters of Phillipsdale Landing. Fluorescence was low this week, ranging from 1.06 to 4.64 mg/m³.