Water column profiles were conducted using a Seabird Electronics profiler at six locations in the Providence River and one location in the Seekonk River on September 22, 2026. In the five days leading up to this, there were 0.27 inches of rain recorded at T.F. Green International Airport (Warwick, RI). Point Street Bridge had a well-mixed water column. The water column was weakly stratified at Bullock Reach, Conimicut Point, Edgewood Yacht Club, Pomham Rocks, and India Point Park. Moderate stratification was observed at Phillipsdale Landing. The water column at Pawtuxet Cove was strongly stratified.
Dissolved oxygen conditions below the hypoxia threshold (2.9 mg/L) were observed throughout the entire water column at Point Street Bridge and India Point Park. Edgewood Yacht Club, Pomham Rocks and Phillipsdale Landing had dissolved oxygen concentrations below the hypoxia threshold in only the lower part of the water column. The highest fluorescence reading was observed 1.75-meters below the surface at Phillipsdale Landing.