Water Column Profiles

​​Water column profile data was collected at a single site on August 31, 2023. Further collection was discontinued due to extreme weather conditions.  In the five days leading up to the survey, 0.14 inches of precipitation were recorded at T.F. Green. 

Data was collected at the Edgewood Yacht Club. The water column here was weakly stratified. Dissolved oxygen (DO) conditions were below the hypoxia threshold (2.9 mg/L) only at the very bottom of the water column. Fluorescence readings at this site reached a maximum value approximately 3 meters below the surface.

​Water column profiles were conducted at eight locations in the Providence and Seekonk River estuaries on August 23, 2023 using a Seabird Electronics profiler. In the five days leading up to the survey, 2.16 inches of precipitation were recorded at T.F. Green. Most sites were moderately to strongly stratified this week, with the exception of Edgewood Shoals, which was weakly stratified

Dissolved oxygen (DO) conditions were below the hypoxia threshold (2.9 mg/L) throughout the water column (upper, middle and lower portions) at the Edgewood Shoals, India Point Park, and Phillipsdale Landing sites, but only in the middle and lower portions of the water column at Edgewood Yacht Club and Pomham Rocks. No hypoxic conditions were observed at Conimicut Point, Pawtuxet Cove or Bullock Reach Buoy. The highest fluorescence readings for the week were measured around 1 meter below the surface at Pawtuxet Cove.​

​Water column profiles were conducted at five locations in the Providence and Seekonk River estuaries on August 16, 2023 using a Seabird Electronics profiler. In the five days leading up to the survey, 0.59 inches of precipitation were recorded at T.F. Green. Most sites were moderately to strongly stratified this week.

Dissolved oxygen (DO) conditions were below the hypoxia threshold (2.9 mg/L) throughout the water column (upper, middle and lower portions) at the Point Street Bridge, India Point Park, and Phillipsdale Landing sites, but only in the middle and lower portions of the water column at Bullock Reach Buoy and Conimicut Point. The highest fluorescence readings for the week were measured around 1.5 meters below the surface at Conimicut Point.

​Water column profiles were conducted at seven locations in the Providence and Seekonk River estuaries on August 9, 2023 using a Seabird Electronics profiler. In the five days leading up to the survey, 0.48 inches of precipitation were recorded at T.F. Green. Most sites were moderately to strongly stratified this week, other than Edgewood Yacht Club, which was weakly stratified.

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

Water column profiles were conducted at six locations in the Providence and Seekonk River estuaries on August 2, 2023 using a Seabird Electronics profiler. In the five days leading up to the survey, 0.66 inches of precipitation were recorded at T.F. Green. All sites were moderately to strongly stratified this week.

Dissolved oxygen (DO) conditions were below the hypoxia threshold (2.9 mg/L) in the middle and lower portions of the water column at every profiled site, and in the full column (upper, middle and bottom portions) at Point Street Bridge, India Point Park, and Phillipsdale Landing. The highest fluorescence readings for the week were measured around 2 meters below the surface at Conimicut Point.​

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.