Fixed-Site Network

Phillipsdale Landing

Sondes were swapped this week on the morning of August 26^th. Overall, the water quality at Phillipsdale Landing was fair this week. Weather conditions were wet, with 0.86 inches of precipitation recorded at T.F. Green. The Blackstone River flow fluctuated throughout the week. Surface salinity averaged 20.0 ppt and ranged from 0.0 ppt to 25.6 ppt. At the bottom, salinity averaged 25.9 ppt and ranged from 20.6 ppt to 29.6 ppt. Temperatures averaged 22.8°C at the surface and 23.0°C at the bottom. Surface temperatures ranged from 12.5°C to 25.0°C, while bottom temperatures ranged from 22.1°C to 24.6°C.

Dissolved oxygen (DO) at Phillipsdale Landing dropped below the hypoxia threshold (i.e., DO >2.9 mg/L) throughout the week. The longest periods of hypoxic conditions spanned 9.5 hours, occurring at the bottom depth on the night of August 30^th into August 31^st. During this period, the bottom DO averaged around 1.81 mg/L. Surface DO averaged 9.5 mg/L and ranged from 2.8 mg/L to 19.9 mg/L. Bottom DO concentrations averaged 4.7 mg/L and ranged from 0.4 mg/L to 14.8 mg/L. Chlorophyll readings increased from last week, averaging 41.1 µg/L at the surface and 38.5 µg/L at the bottom. Maximum chlorophyll at the surface reached 437.8 µg/L on the morning of August 26^th. Please note that tidal fluctuations and Blackstone River flows greatly influence water column salinity, temperature, and DO at this location. 

Bullock Reach

Overall, water quality was good to fair at Bullock Reach this week. Salinity averaged 29.1 ppt, 30.7 ppt, and 30.3 ppt at the surface, middle, and bottom sondes, respectively. Surface salinity ranged 27.6– 30.2 ppt, middle salinity ranged 29.2 -31.9 ppt, and bottom salinity ranged 31.0 – 32.7 ppt. Surface temperature averaged 22.5°C and ranged from 21.2°C to 23.9C. Middle temperature averaged 22.2°C, and ranged from 21.2°C to 23.4°C.  Bottom temperatures averaged 21.9°C and ranged from 21.2°C to 22.7°C.

Dissolved oxygen (DO) at Bullock Reach remained above the hypoxia threshold (i.e., DO >2.9 mg/L) throughout the week. Surface DO averaged 7.6 mg/L, and ranged 5.7 – 9.8 mg/L. Middle DO averaged 6.5 mg/L, and ranged 4.8 – 8.3 mg/L. At the bottom, DO averaged 5.7 mg/L and ranged 4.6 – 7.2 mg/L.  Chlorophyll readings ranged from low to elevated throughout the week. Readings averaged 9.1 µg/L at the surface, 11.2 µg/L at the middle, and 7.8 µg/L at the bottom.  The maximum surface chlorophyll was 18.29 µg/L on the afternoon of August 30^th.

Phillipsdale Landing

Overall, the water quality at Phillipsdale Landing was fair this week. Weather conditions were wet this week, with 0.99 inches of precipitation recorded at T.F. Green. The Blackstone River flow fluctuated throughout the week. Surface salinity averaged 22.2 ppt and ranged from 16.6 ppt to 26.7 ppt. At the bottom, salinity averaged 27.0 ppt and ranged from 18.8 ppt to 30.7 ppt. Surface temperature decreased this week, averaging 23.2°C at the surface and ranging 20.2°C – 25.7°C. The bottom temperature decreased averaged 23.4°C and ranged 21.2°C – 25.7°C.

Dissolved oxygen (DO) at Phillipsdale Landing dropped below the hypoxia threshold (i.e., DO >2.9 mg/L) throughout the week. The longest periods of hypoxic conditions spanned 8 hours, occurring at the bottom depth on the night of August 19^th. During this period, the bottom DO averaged around 2.15 mg/L. Surface DO averaged 7.7 mg/L and ranged from 2.2 mg/L to 15.9 mg/L. Bottom DO concentrations averaged 4.0 mg/L and ranged from 1.0 mg/L to 12.6 mg/L. Chlorophyll readings increased at the surface from last week, averaging 35.5 µg/L and decreased at the bottom, averaging 22.7 µg/L. Maximum chlorophyll at the surface reached 213.3 µg/L on August 21^st. Please note that tidal fluctuations and Blackstone River flows greatly influence water column salinity, temperature, and DO at this location. 

Bullock Reach

Sondes were swapped this week on the morning of August 19^th. Overall, water quality was good at Bullock Reach this week. Salinity averaged 28.9 ppt, 30.1 ppt, and 31.5 ppt at the surface, middle, and bottom sondes, respectively. Surface salinity ranged 27.2– 30.5 ppt, mid salinity ranged 27.8 – 31.5 ppt, and bottom salinity ranged 28.2 – 32.6 ppt. Surface temperature averaged 22.7°C and ranged from 20.9°C to 25.2°C. Mid temperatures averaged 22.6°C and ranged from 21.1°C to 25.2°C. Bottom temperatures averaged 22.1°C and ranged from 20.8°C to 24.5°C.

Dissolved oxygen (DO) at Bullock Reach remained above the hypoxia threshold (i.e., DO >2.9 mg/L) throughout the week. Surface DO averaged 7.1 mg/L and ranged 5.5 – 9.4 mg/L. In the mid waters, DO averaged 6.3 mg/L and ranged 4.3 – 8.3 mg/L. At the bottom, DO averaged 5.4 mg/L and ranged 3.6 – 7.8 mg/L.  Chlorophyll readings ranged from low to elevated throughout the week. Readings averaged 10.2 µg/L at the surface, 11.8 µg/L at mid-depth, and 8.4 µg/L at the bottom.  The maximum surface chlorophyll was 26.7 µg/L on the afternoon of August 18^th.

Phillipsdale Landing

Sondes were swapped this week on the morning of August 14^th. Overall, the water quality at Phillipsdale Landing was good to fair this week. Weather conditions included sporadic rain events, with 0.37 inches of precipitation recorded at T.F. Green. The Blackstone River flow fluctuated throughout the week. Surface salinity averaged 20.7 ppt and ranged from 12.2 ppt to 25.0 ppt. At the bottom, salinity averaged 24.8 ppt and ranged from 19.1 ppt to 29.3 ppt. Temperatures averaged 25.6°C at the surface and 25.2°C at the bottom. Surface temperatures ranged from 22.0°C to 27.9°C, while bottom temperatures ranged from 24.1°C to 26.8°C.

Dissolved oxygen (DO) at Phillipsdale Landing remained the hypoxia threshold (i.e., DO >2.9 mg/L) at the surface, while DO at the bottom waters dropped below the hypoxic threshold throughout the week. The longest period of hypoxic conditions spanned 6 hours, occurring during the day of August 16^th. During this period, the bottom DO averaged around 2.32 mg/L. Surface DO averaged 6.9 mg/L and ranged from 3.2 mg/L to 13.3 mg/L. Bottom DO concentrations averaged 4.2 mg/L and ranged from 1.4 mg/L to 12.4 mg/L. Chlorophyll readings decreased from last week, averaging 26.7 µg/L at the surface and 27.0 µg/L at the bottom. Maximum chlorophyll at the surface reached 154.4 µg/L on the morning of August 16^th. Please note that tidal fluctuations and Blackstone River flows greatly influence water column salinity, temperature, and DO at this location. 

Bullock Reach

Overall, water quality was good to fair at Bullock Reach this week. Salinity averaged 28.2 ppt, 29.5 ppt, and 30.4 ppt at the surface, middle, and bottom sondes, respectively. Surface salinity ranged 26.0– 29.6 ppt, middle salinity ranged 0.0 – 30.7 ppt, and bottom salinity ranged 29.2 – 31.3 ppt. Surface temperature averaged 25.0°C and ranged from 23.5°C to 26.5°C. Middle temperature averaged 24.3°C and ranged from 22.7°C to 25.8°C. Bottom temperatures averaged 23.2°C and ranged from 21.3°C to 24.9°C.

Dissolved oxygen (DO) at Bullock Reach remained above the hypoxia threshold (i.e., DO >2.9 mg/L) at the surface and middle depths throughout the week. DO at the bottom waters dropped below the hypoxic threshold for half an hour on the morning of August 11^th.  Surface DO averaged 7.5 mg/L and ranged 5.6 – 10.1 mg/L. At the middle depth, DO averaged 5.9 mg/L and ranged 3.9 – 8.6 mg/L. At the bottom, DO averaged 4.4 mg/L and ranged 2.4 – 6.4 mg/L.  Chlorophyll readings ranged from low to elevated throughout the week. Readings averaged 16.3 µg/L at the surface, 10.1 at the middle, and 3.7 µg/L at the bottom.  The maximum surface chlorophyll was 34.4 µg/L on the afternoon of August 15^th.

Phillipsdale Landing

Overall, the water quality at Phillipsdale Landing was fair this week. Weather conditions were dry, with no precipitation recorded at T.F. Green. The Blackstone River flow fluctuated throughout the week. Surface salinity averaged 18.3 ppt and ranged from 6.8 ppt to 26.1 ppt. At the bottom, salinity averaged 25.1 ppt and ranged from 14.7 ppt to 28.7 ppt. Surface temperature increased this week, averaging 24.2°C at the surface and ranging 22.5°C – 26.5°C. The bottom temperature increased averaged 23.2°C and ranged 21.9°C – 25.0°C.

Dissolved oxygen (DO) at Phillipsdale Landing dropped below the hypoxia threshold (i.e., DO >2.9 mg/L) throughout the week. The longest periods of hypoxic conditions spanned 21.75 hours, occurring at the bottom depth from the afternoon of August 6^th until the morning of August 7^th.  During this period, the bottom DO averaged around 1.69 mg/L. Surface DO averaged 9.1 mg/L and ranged from 1.9 mg/L to 22.2 mg/L. Bottom DO concentrations averaged 3.4 mg/L and ranged from 0.0 mg/L to 12.0 mg/L. Chlorophyll readings increased from last week, averaging 30.1 µg/L at the surface and 33.1 µg/L at the bottom. Maximum chlorophyll at the surface reached 349.2 µg/L on the morning of August 5^th. Please note that tidal fluctuations and Blackstone River flows greatly influence water column salinity, temperature, and DO at this location. 

Bullock Reach

Sondes were swapped this week on the morning of August 5^th. Overall, water quality was good to fair at Bullock Reach this week. Salinity averaged 27.8 ppt, 29.6 ppt, and 31.1 ppt at the surface, middle, and bottom sondes, respectively. Surface salinity ranged 24.3– 29.6 ppt, mid salinity ranged 27.5 – 30.9 ppt, and bottom salinity ranged 29.5 – 32.1 ppt. Surface temperature averaged 23.6°C and ranged from 22.5°C to 25.0°C. Mid temperatures averaged 22.9°C and ranged from 21.0°C to 24.0°C. Bottom temperatures averaged 21.1°C and ranged from 19.7°C to 23.3°C.

Dissolved oxygen (DO) at Bullock Reach remained above the hypoxia threshold (i.e., DO >2.9 mg/L) at the surface and middle depths throughout the week, while DO at the bottom waters dropped below the hypoxic threshold at the start of the week. Surface DO averaged 8.3 mg/L and ranged 5.9 – 11.9 mg/L. In the mid waters, DO averaged 6.2 mg/L and ranged 3.1 – 8.8 mg/L. At the bottom, DO averaged 3.4 mg/L and ranged 1.9 – 6.8 mg/L.  Chlorophyll readings ranged from low to elevated throughout the week. Readings averaged 14.4 µg/L at the surface, 9.8 µg/L at mid-depth, and 4.4 µg/L at the bottom.  The maximum surface chlorophyll was 33.4 µg/L on the afternoon of August 5^th.

Phillipsdale Landing

Sondes were swapped this week on the morning of July 29^th. Overall, the water quality at Phillipsdale Landing was fair this week. Weather conditions included frequent rain events this week, with 0.74 inches of precipitation recorded at T.F. Green. The Blackstone River flow fluctuated throughout the week. Surface salinity averaged 18.0 ppt and ranged from 6.2 ppt to 23.4 ppt. At the bottom, salinity averaged 24.7 ppt and ranged from 11.1 ppt to 29.4 ppt. Temperatures averaged 25.3°C at the surface and 24.1°C at the bottom. Surface temperatures ranged from 22.6°C to 29.8°C, while bottom temperatures ranged from 21.9°C to 26.4°C.

Dissolved oxygen (DO) at Phillipsdale Landing dropped below the hypoxia threshold (i.e., DO >2.9 mg/L) throughout the week. The longest periods of hypoxic conditions spanned 10.0 hours, occurring during the morning of July 28^th. During this period, the bottom DO averaged around 1.98 mg/L. Surface DO averaged 8.3 mg/L and ranged from 1.8 mg/L to 20.7 mg/L. Bottom DO concentrations averaged 3.0 mg/L and ranged from 0.0 mg/L to 13.3 mg/L. Chlorophyll readings decreased from last week, averaging 24.2 µg/L at the surface and 27.5 µg/L at the bottom. Maximum chlorophyll reached 326.4 µg/L in the bottom waters during the afternoon of August 3^rd. Please note that tidal fluctuations and Blackstone River flows greatly influence water column salinity, temperature, and DO at this location. 

Bullock Reach

Overall, water quality was good to fair at Bullock Reach this week. Salinity averaged 27.4 ppt, and 29.1 ppt at the surface, and bottom sondes, respectively. Surface salinity ranged 25.3– 29.4 ppt, middle salinity ranged 26.9 – 31.4 ppt, and bottom salinity ranged 29.5 – 32.7 ppt. Surface temperature averaged 24.6°C and ranged from 21.8°C to 27.6°C. Middle temperatures averaged 23.8°C and ranged from 20.9 – 26.7°C. Bottom temperatures averaged 21.5°C and ranged from 19.3°C to 23.8°C.

Dissolved oxygen (DO) at Bullock Reach remained above the hypoxia threshold (i.e., DO >2.9 mg/L) at the surface throughout the week, while DO at the middle and bottom waters dropped below the hypoxic threshold at the start of the week. Surface DO averaged 7.6 mg/L and ranged 4.9 – 11.0 mg/L. At the middle, DO averaged 5.5 mg/L and ranged 2.8 – 9.3 mg/L. At the bottom, DO averaged 4.2 mg/L and ranged 2.8 – 5.3 mg/L.  Chlorophyll readings ranged from low to elevated throughout the week. Readings averaged 11.9 µg/L at the surface, 15.5 µg/L at the middle, and 5.7 µg/L at the bottom.  The maximum surface chlorophyll was 41.8 µg/L on the afternoon of July 29^th.

Phillipsdale Landing

Overall, the water quality at Phillipsdale Landing was fair this week. Weather conditions included trace amounts of rain this week, recorded at T.F. Green. The Blackstone River flow fluctuated throughout the week. Surface salinity averaged 19.5 ppt and ranged from 9.2 ppt to 25.4 ppt. At the bottom, salinity averaged 24.2 ppt and ranged from 10.4 ppt to 29.0 ppt. Surface temperature decreased this week, averaging 24.9°C at the surface and ranging 22.7°C – 29.0°C. The bottom temperature increased this week, averaging 24.3°C and ranged 22.4°C – 25.9°C.

Dissolved oxygen (DO) at Phillipsdale Landing dropped below the hypoxia threshold (i.e., DO >2.9 mg/L) throughout the week. The longest periods of hypoxic conditions spanned 21.0 hours, occurring at the bottom depth from the afternoon of July 21^st until July 22^nd.  During this period, the bottom DO averaged around 1.68 mg/L. Surface DO averaged 6.2 mg/L and ranged from 0.8 mg/L to 15.4 mg/L. Bottom DO concentrations averaged 3.4 mg/L and ranged from 0.3 mg/L to 12.0 mg/L. Chlorophyll readings decreased from last week, averaging 30.7 µg/L at the surface and 20.8 µg/L at the bottom. Maximum chlorophyll at the surface reached 236.9 µg/L on the afternoon of July 25^th. Please note that tidal fluctuations and Blackstone River flows greatly influence water column salinity, temperature, and DO at this location. 

Bullock Reach

Sondes were swapped this week on the morning of July 22^nd. Overall, water quality was fair to good at Bullock Reach this week. Salinity averaged 27.2 ppt, 28.9 ppt, and 30.6 ppt at the surface, middle, and bottom sondes, respectively. Surface salinity ranged 24.4– 29.2 ppt, mid salinity ranged 26.5 – 30.1 ppt, and bottom salinity ranged 29.1 – 32.0 ppt. Surface temperature averaged 24.5°C and ranged from 23.2°C to 25.9°C. Mid temperatures averaged 24.3°C and ranged from 23.3°C to 25.4°C. Bottom temperatures averaged 22.8°C and ranged from 20.9°C to 24.4°C.

Dissolved oxygen (DO) at Bullock Reach remained above the hypoxia threshold (i.e., DO >2.9 mg/L) at the surface and middle depths throughout the week, while DO at the bottom waters dropped below the hypoxic threshold at the start of the week. Surface DO averaged 7.2 mg/L and ranged 5.2– 10.4 mg/L. In the mid waters, DO averaged 6.2 mg/L and ranged 3.8 – 8.0 mg/L. At the bottom, DO averaged 4.3 mg/L and ranged 2.0 – 6.7 mg/L.  Chlorophyll readings ranged from low to elevated throughout the week. Readings averaged 13.0 µg/L at the surface, 15.8 µg/L at mid-depth, and 9.1 µg/L at the bottom.  The maximum chlorophyll of 31.9 µg/L was on the bottom on the morning of July 24^th.

Phillipsdale Landing

Sondes were swapped this week on the morning of July 15^th. Overall, the water quality at Phillipsdale Landing was fair this week. Weather conditions were dry, with only a trace of precipitation recorded at T.F. Green. The Blackstone River flow fluctuated throughout the week. Surface salinity averaged 12.6 ppt and ranged from 2.3 ppt to 24.0 ppt. At the bottom, salinity averaged 21.2 ppt and ranged from 10.3 ppt to 28.1 ppt. Temperatures averaged 25.7°C at the surface and 6.9°C at the bottom. Surface temperatures ranged from 5.6°C to 6.8°C, while bottom temperatures ranged from 6.1°C to 7.1°C.

Dissolved oxygen (DO) at Phillipsdale Landing dropped below the hypoxia threshold (i.e., DO >2.9 mg/L) throughout the week. The longest periods of hypoxic conditions spanned 11.5 hours, occurring during the day of July 18^th. During this period, the bottom DO averaged around 1.99 mg/L. Surface DO averaged 8.1 mg/L and ranged from 2.1 mg/L to 17.4 mg/L. Bottom DO concentrations averaged 2.6 mg/L and ranged from 0.3 mg/L to 9.7 mg/L. Chlorophyll readings increased from last week, averaging 46.4 µg/L at the surface and 28.2 µg/L at the bottom. Maximum chlorophyll at the surface reached 296.8 µg/L on the morning of July 17^th. Please note that tidal fluctuations and Blackstone River flows greatly influence water column salinity, temperature, and DO at this location. 

Bullock Reach

Due to water intrusion, Bullock Reach’s middle sonde was retrieved July 7^th. No data is available at the mid depth this week. Overall, water quality was good to fair at Bullock Reach this week. Salinity averaged 25.1 ppt, and 30.3 ppt at the surface, and bottom sondes, respectively. Surface salinity ranged 22.3– 28.0 ppt, and bottom salinity ranged 28.3 – 31.1 ppt. Surface temperature averaged 25.5°C and ranged from 23.9°C to 27.7°C. Bottom temperatures averaged 21.7°C and ranged from 19.9°C to 26.4°C.

Dissolved oxygen (DO) at Bullock Reach remained above the hypoxia threshold (i.e., DO >2.9 mg/L) at the surface throughout the week, while DO at the bottom waters dropped below the hypoxic threshold throughout the week. Surface DO averaged 7.7 mg/L and ranged 5.7 – 10.7 mg/L. At the bottom, DO averaged 3.2 mg/L and ranged 2.0 – 5.6 mg/L.  Chlorophyll readings ranged from low to elevated throughout the week. Readings averaged 22.3 µg/L at the surface, and 3.7 µg/L at the bottom.  The maximum surface chlorophyll was 40.3 µg/L on the afternoon of July 15^th.

Phillipsdale Landing

Overall, the water quality at Phillipsdale Landing was fair this week. Weather conditions included frequent rain events this week, with 2.33 inches of precipitation recorded at T.F. Green. The Blackstone River flow fluctuated throughout the week. Surface salinity averaged 11.1 ppt and ranged from 2.9 ppt to 22.5 ppt. At the bottom, salinity averaged 21.3 ppt and ranged from 5.1 ppt to 28.2 ppt. Surface temperature increased this week, averaging 25.0°C at the surface and ranging 22.9°C – 28.8°C. The bottom temperature decreased averaged 21.3°C and ranged 5.1°C – 28.2°C.

Dissolved oxygen (DO) at Phillipsdale Landing dropped below the hypoxia threshold (i.e., DO >2.9 mg/L) throughout the week. The longest periods of hypoxic conditions spanned 22.5 hours, occurring at the bottom depth from the afternoon of July 9^th until July 10^th.  During this period, the bottom DO averaged around 1.69 mg/L. Surface DO averaged 7.1 mg/L and ranged from 2.1 mg/L to 13.2 mg/L. Bottom DO concentrations averaged 2.9 mg/L and ranged from 0.4 mg/L to 8.1 mg/L. Chlorophyll readings decreased from last week, averaging 24.8 µg/L at the surface and 24.0 µg/L at the bottom. Maximum chlorophyll at the surface reached 97.0 µg/L on the morning of July 8^th. Please note that tidal fluctuations and Blackstone River flows greatly influence water column salinity, temperature, and DO at this location. 

Bullock Reach

Sondes were swapped this week on the morning of July 9^th. Overall, water quality was good at Bullock Reach this week. Salinity averaged 25.8 ppt, 28.7 ppt, and 30.8 ppt at the surface, middle, and bottom sondes, respectively. Surface salinity ranged 22.3– 28.5 ppt, mid salinity ranged 25.2 – 29.3 ppt, and bottom salinity ranged 29.0 – 31.9 ppt. Surface temperature averaged 24.5°C and ranged from 23.0°C to 26.0°C. Mid temperatures averaged 24.3°C and ranged from 23.3°C to 25.3°C. Bottom temperatures averaged 20.7°C and ranged from 18.4°C to 23.6°C.

Dissolved oxygen (DO) at Bullock Reach remained above the hypoxia threshold (i.e., DO >2.9 mg/L) throughout the week. Surface DO averaged 6.8 mg/L and ranged 3.8 – 11.6 mg/L. In the mid waters, DO averaged 6.6 mg/L and ranged 4.7 – 7.8 mg/L. At the bottom, DO averaged 3.8 mg/L and ranged 2.9 – 6.2 mg/L.  Chlorophyll readings ranged from low to elevated throughout the week. Readings averaged 14.2 µg/L at the surface, 13.5 µg/L at mid-depth, and 4.8 µg/L at the bottom.  The maximum surface chlorophyll was 58.9 µg/L on the afternoon of July 13^th.

Phillipsdale Landing

Sondes were swapped this week on July 1^st. Overall, water quality at Phillipsdale Landing was poor to good this week. Weather conditions were moderately rainy this week, with a total of 0.55 inches recorded at T.F. Green, and the majority of rainfall occurring on the 3^rd.  Blackstone River flow reached its peak on July 3^rd, where the flow was similar to the 20-year daily median flow, but was otherwise below the 20-year daily median value for the rest of the week.   Salinity at the surface averaged 15.5 ppt and ranged from 6.5 ppt to 23.3 ppt. At the bottom, salinity averaged 23.8 ppt and ranged from 16.1 ppt to 28.5 ppt. Temperatures this week averaged 24.6 °C at the surface and 22.3 °C at the bottom. Surface temperatures ranged from 21.8  °C to 28.5 °C, while bottom temperatures ranged from 20.2 °C to 24.9 °C.

Dissolved oxygen (DO) at Phillipsdale Landing remained above the hypoxia threshold (i.e., DO >2.9 mg/L) at the surface, but below the hypoxia threshold at the bottom for most of the week. Hypoxic conditions were observed at the surface briefly during the morning on July 1^st. Hypoxic conditions were observed at the bottom for multiple extended periods from July 2^nd to July 6^th, including one 21-hour period from the evening of July 2^nd to the evening of July 3^rd. Surface DO averaged 9.4 mg/L and ranged from 2.8 to 20.8 mg/L. Bottom water DO concentration averaged 2.8 mg/L and ranged from 0.8 mg/L to 8.8 mg/L. Chlorophyll ranged from low to elevated levels throughout the week, averaging 38.6 ug/L at the surface and 34.7 ug/L at the bottom, with evidence of substantial phytoplankton blooms occurring throughout the week. Maximum surface chlorophyll readings reached 113.1 ug/L on the afternoon of July 5^th. Please note that tidal fluctuations and Blackstone River flows greatly influence water column salinity, temperature, and DO at this location.

Bullock Reach

Overall, water quality ranged from fair to good at Bullock Reach this week. Salinity averaged 27.0 ppt, 29.0 ppt, and 30.8 ppt at the surface, middle, and bottom sondes, respectively. Surface salinity ranged from 24.9 to 28.7 ppt, mid salinity ranged from 26.2 to 30.8 ppt, and bottom salinity ranged from 29.3 to 31.9 ppt. Surface temperature averaged 23.4 °C and ranged from 21.4 °C to 25.3 °C. Mid temperatures averaged 22.3 °C and ranged from 20.0 °C to 24.5 °C. Bottom temperatures averaged 20.2 °C and ranged from 19.0 °C to 23.3 °C.

DO at Bullock Reach remained above the hypoxia threshold (i.e., DO >2.9 mg/L) throughout the week. Surface DO averaged 7.4 mg/L and ranged from 5.2 to 10.2 mg/L. In the mid waters, DO averaged 5.9 mg/L and ranged from 3.9 to 8.6 mg/L. At the bottom, DO averaged 4.6 mg/L and ranged 3.0 to 7.1 mg/L.  Chlorophyll readings ranged from low to moderate, with evidence of moderate phytoplankton blooms occurring throughout the week. Readings averaged 10.1 µg/L at the surface, 13.1 µg/L at mid-depth, and 9.2 µg/L at the bottom.  The maximum surface chlorophyll was 32.8 µg/L on the afternoon of July 4^th.

Phillipsdale Landing

Overall, water quality at Phillipsdale Landing was poor to good this week. Weather conditions were relatively dry this week, with a total of 0.07 inches recorded at T.F. Green, and the majority of rainfall occurring on the 26^th.  Blackstone River flow decreased slightly over the course of the week, and remained below the 20-year daily median flow. Salinity at the surface averaged 20.6 ppt and ranged from 14.3 ppt to 25.3 ppt. At the bottom, salinity averaged 23.4 ppt and ranged from 4.6 ppt to 27.2 ppt. Temperatures this week averaged 22.3 °C at the surface and 21.4 °C at the bottom. Surface temperatures ranged from 19.8 °C to 26.4 °C, while bottom temperatures ranged from 19.4 °C to 24.6 °C.

Dissolved oxygen (DO) at Phillipsdale Landing remained above the hypoxia threshold (i.e., DO >2.9 mg/L) for most of the week. Hypoxic conditions were observed at the surface briefly during early morning on June 27^th and June 29^th. Hypoxic conditions were observed at the bottom for multiple hours in the early morning of June 27^th, briefly in the evening of June 28^th, and for multiple hours in the evening of June 29^th. Surface DO averaged 7.3 mg/L and ranged from 2.8 to 15.1 mg/L. Bottom water DO concentration averaged 5.3 mg/L and ranged from 2.3 mg/L to 12.3 mg/L. Chlorophyll ranged from low to elevated levels throughout the week, averaging 22.2 ug/L at the surface and 16.1 ug/L at the bottom, with evidence of moderate phytoplankton blooms occurring throughout the week. Maximum surface chlorophyll readings reached 92.1 ug/L on the early morning of June 27^st. Please note that tidal fluctuations and Blackstone River flows greatly influence water column salinity, temperature, and DO at this location.

Bullock Reach

Sondes were swapped this week on June 24^th. Overall, water quality ranged from fair to good at Bullock Reach this week. Salinity averaged 26.1 ppt, 28.4 ppt, and 30.4 ppt at the surface, middle, and bottom sondes, respectively. Surface salinity ranged from 22.2 to 29.1 ppt, mid salinity ranged from 24.9 to 30.6 ppt, and bottom salinity ranged from 28.4 to 31.4 ppt. Surface temperature averaged 22.6 °C and ranged from 20.2 °C to 26.5 °C. Mid temperatures averaged 21.1 °C and ranged from 19.2 °C to 24.6 °C. Bottom temperatures averaged 19.1 °C and ranged from 17.4 °C to 20.6 °C.

DO at Bullock Reach remained above the hypoxia threshold (i.e., DO >2.9 mg/L) throughout the week. Surface DO averaged 7.6 mg/L and ranged from 5.1 to 11.3 mg/L. In the mid waters, DO averaged 6.0 mg/L and ranged from 3.9 to 9.7 mg/L. At the bottom, DO averaged 4.9 mg/L and ranged 3.9 to 6.3 mg/L.  Chlorophyll readings ranged from low to moderate, with evidence of moderate phytoplankton blooms occurring throughout the week. Readings averaged 10.1 µg/L at the surface, 12.5 µg/L at mid-depth, and 9.8 µg/L at the bottom.  The maximum surface chlorophyll was 42.7 µg/L on the afternoon of June 28^th.