Water Column Profiles

​​Water column profiles were conducted at six locations in the Providence and Seekonk River estuaries on September 27, 2023 using a Seabird Electronics profiler. In the five days leading up to the survey, 2.77 inches of precipitation were recorded at T.F. Green. All sites were strongly or moderately stratified this week.

Dissolved oxygen (DO) conditions were below the hypoxia threshold (2.9 mg/L) in the lower portion of the water column at the India Point Park site, and in the lower and middle portions of the water column at Point Street Bridge. The highest fluorescence readings for the week were measured around 3 meters below the surface at the Bullock Reach Buoy.

​Water column profile data was collected at seven sites on September 20, 2023. However, due to an equipment deployment issue, only the data from the Phillipsdale Landing site was usable. In the five days leading up to the survey, 1.55 inches of precipitation were recorded at T.F. Green. 

At the Phillipsdale Landing, the water column here was strongly stratified. Dissolved oxygen (DO) conditions were not observed below the hypoxia threshold (2.9 mg/L), but approached this threshold near the very bottom of the water column. Fluorescence readings at this site were relatively low, but reached a maximum value approximately 2 meters below the surface.

​Water column profiles were conducted at seven locations in the Providence and Seekonk River estuaries on September 14, 2023 using a Seabird Electronics profiler. In the five days leading up to the survey, 1.23 inches of precipitation were recorded at T.F. Green. All sites were strongly stratified this week.

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

​Water column profiles were conducted at seven locations in the Providence and Seekonk River estuaries on September 6, 2023 using a Seabird Electronics profiler. In the five days leading up to the survey, no precipitation was recorded at T.F. Green. Most sites were moderately to weakly stratified this week.

Dissolved oxygen (DO) conditions were below the hypoxia threshold (2.9 mg/L) in the lower portion of the water column at the Pomham Rocks, India Point Park, and Phillipsdale Landing sites. The highest fluorescence readings for the week were measured around 1.5 meters below the surface at Edgewood Yacht Club.

​​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.​