Phillipsdale Landing
Overall, water quality at Phillipsdale Landing was fair to good this week. Weather conditions were wet this week, with a total of 2.31 inches recorded at T.F. Green, and the majority of rainfall occurring on the 26th. The Blackstone River flow peaked on the 23rd and 24th, but remained above the 20-year daily median for the entire week. Salinity at the surface averaged 5.4 ppt and ranged from 0.3 ppt to 12.7 ppt. At the bottom, salinity averaged 12.3 ppt and ranged from 0.1 ppt to 37.2 ppt; however, the salinity data for the first part of the week also exhibits some anomalous behavior, and may be tied to a sensor malfunction. Temperatures this week averaged 14.6 °C at the surface and 13.7 °C at the bottom. Surface temperatures ranged from 12.0 °C to 19.1 °C, while bottom temperatures ranged from 12.2 °C to 18.0 °C.
Dissolved oxygen (DO) at Phillipsdale Landing remained above the hypoxia threshold (i.e., DO >2.9 mg/L) throughout the week. Surface DO averaged 9.2 mg/L and ranged from 7.1 -11.4 mg/L. Bottom water DO concentration averaged 7.6 mg/L and ranged from 3.4 mg/L to 11.3 mg/L. Chlorophyll was low, averaging 1.1 ug/L at the surface and 1.5 ug/L at the bottom. Maximum surface chlorophyll readings reached 2.4 ug/L. Please note that tidal fluctuations and Blackstone River flows greatly influence water column salinity, temperature, and DO at this location.
The bottom sonde had a malfunctioning depth sensor, thus no depth data is available for the bottom sonde until the sondes were swapped out on May 20th.
Bullock Reach
The Bullock Reach Buoy remains out of the water for the winter. EM will coordinate with RIDEM to redeploy the buoy in late spring-early summer.