Fixed-Site Network

Phillipsdale Landing

Overall, the water quality at Phillipsdale Landing was fair to good 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 21.0 ppt and ranged from 10.6 ppt to 27.3 ppt. At the bottom, salinity averaged 21.0 ppt and ranged from 10.6 ppt to 27.3 ppt. Temperatures decreased this week, averaging 21.1°C at the surface and 21.3°C at the bottom. Surface temperatures ranged from 17.9°C to 23.2°C, while bottom temperatures ranged from 19.4°C to 23.0°C.

Dissolved oxygen (DO) at Phillipsdale Landing remained above the hypoxia threshold (i.e., DO>2.9mg/L) at the surface, but dropped below the hypoxia threshold at the bottom depths. The longest periods of hypoxic conditions spanned 7.5 hours, occurring at the bottom depth from the morning of October 2^nd.  During this period, the bottom DO averaged around 1.93 mg/L. Surface DO averaged 6.6 mg/L and ranged from 3.1 mg/L to 11.3 mg/L. Bottom DO concentrations averaged 3.7 mg/L and ranged from 1.1 mg/L to 9.5 mg/L. Chlorophyll readings increased from last week, averaging 10.5 µg/L at the surface and 12.7 µg/L at the bottom. Maximum chlorophyll at the surface reached 31.8 µg/L on the afternoon of October 2^nd. 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 afternoon of September 30^th. Overall, water quality was good at Bullock Reach this week. Salinity averaged 28.7 ppt, 30.3 ppt, and 31.9 ppt at the surface, middle, and bottom sondes, respectively. Surface salinity ranged 24.6– 30.8 ppt, mid salinity ranged 26.4 – 32.2 ppt, and bottom salinity ranged 29.9 – 33.0 ppt. Surface temperature averaged 20.5°C and ranged from 18.6°C to 22.7°C. Mid temperatures averaged 20.5°C and ranged from 19.2°C to 22.2°C. Bottom temperatures averaged 20.4°C and ranged from 19.7°C to 21.3°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 7.3 mg/L and ranged 5.3 – 10.8 mg/L. In the mid waters, DO averaged 6.2 mg/L and ranged 3.4 – 8.4 mg/L. At the bottom, DO averaged 5.0 mg/L and ranged 3.7 – 6.8 mg/L.  Chlorophyll readings ranged from low to elevated throughout the week. Readings averaged 12.9 µg/L at the surface, 10.8 µg/L at mid-depth, and 7.7 µg/L at the bottom.  The maximum surface chlorophyll was 33.3 µg/L on the afternoon of September 30^th.

Phillipsdale Landing

Sondes were swapped this week on the morning of September 23^rd. Overall, the water quality at Phillipsdale Landing was fair this week Weather conditions included frequent rain events this week, with 4.33 inches of precipitation recorded at T.F. Green. The Blackstone River flow fluctuated throughout the week. Surface salinity averaged 19.8 ppt and ranged from 9.2 ppt to 26.4 ppt. At the bottom, salinity averaged 24.6 ppt and ranged from 15.1 ppt to 28.5 ppt. Temperatures averaged 22.0°C at the surface and 21.8°C at the bottom. Surface temperatures ranged from 20.2°C to 23.8°C, while bottom temperatures ranged from 21.2°C to 22.7°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 18.25 hours, occurring during the night of September 27^th to the afternoon of September 28^th. During this period, the bottom DO averaged around 2.13 mg/L. Surface DO averaged 5.3 mg/L and ranged from 2.4 mg/L to 9.9 mg/L. Bottom DO concentrations averaged 3.5 mg/L and ranged from 1.3 mg/L to 8.7 mg/L. Chlorophyll readings averaged 8.0 µg/L at the surface and 9.3 µg/L at the bottom. Maximum chlorophyll at the surface reached 42.9 µg/L on the morning of September 24^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 at Bullock Reach this week. Salinity averaged 28.1 ppt, 31.5 ppt, and 32.1 ppt at the surface, middle, and bottom sondes, respectively. Surface salinity ranged 25.0 – 30.4 ppt, middle salinity range 28.9 – 32.5 ppt, and bottom salinity ranged 31.1 – 32.7 ppt. Surface temperature averaged 21.3°C and ranged from 20.2°C to 22.8°C. Middle temperature averaged 21.0°C and ranged from 20.3°C to 21.7°C. Bottom temperatures averaged 20.8°C and ranged from 20.4°C to 21.2°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 4.8 – 10.1 mg/L. Middle DO averaged 5.9 mg/L and ranged 4.1 – 8.5 mg/L. At the bottom, DO averaged 5.5 mg/L and ranged 4.3 – 6.5 mg/L.  Chlorophyll readings ranged from low to elevated throughout the week. Readings averaged 6.6 µg/L at the surface, 10.4 µg/L at the middle, and 6.4 µg/L at the bottom.  The maximum surface chlorophyll was 21.9 µg/L on the afternoon of September 28^th.

Phillipsdale Landing

Overall, the water quality at Phillipsdale Landing was fair this week. Weather conditions were wet this week, with 0.32 inches of precipitation recorded at T.F. Green. The Blackstone River flow fluctuated throughout the week, while remaining below the 20-year daily median. Surface salinity averaged 23.7 ppt and ranged from 17.8 ppt to 27.3 ppt. At the bottom, salinity averaged 26.7 ppt and ranged from 22.6 ppt to 28.7 ppt. Temperatures averaged 21.9°C at the surface and 21.8°C at the bottom. Surface temperatures ranged from 19.6°C to 23.7°C, while bottom temperatures ranged from 21.3°C to 22.8°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 3.5 hours, occurring at the bottom depth from the morning of September 19^th.  During this period, the bottom DO averaged around 2.57 mg/L. Surface DO averaged 5.9 mg/L and ranged from 2.8 mg/L to 14.1 mg/L. Bottom DO concentrations averaged 3.8 mg/L and ranged from 2.3 mg/L to 7.0 mg/L. Chlorophyll readings decreased from last week, averaging 9.7 µg/L at the surface and 3.1 µg/L at the bottom. Maximum chlorophyll at the surface reached 55.7 µg/L on the afternoon of September 15^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 September 16^th. Overall, water quality was good at Bullock Reach this week. Salinity averaged 28.8 ppt, 31.2ppt, and 32.4 ppt at the surface, middle, and bottom sondes, respectively. Surface salinity ranged 27.2– 30.3 ppt, mid salinity ranged 28.9 – 32.9 ppt, and bottom salinity ranged 30.8 – 33.1 ppt. Surface temperature averaged 21.4°C and ranged from 20.1°C to 22.9°C. Mid temperatures averaged 21.3°C and ranged from 20.4°C to 22.3°C. Bottom temperatures averaged 21.0C and ranged from 20.7°C to 21.3°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 7.8 mg/L and ranged 6.0 – 10.6 mg/L. In the mid waters, DO averaged 6.6 mg/L and ranged 4.4 – 9.7 mg/L. At the bottom, DO averaged 5.3 mg/L and ranged 4.3 – 6.5 mg/L.  Chlorophyll readings ranged from low to elevated throughout the week. Readings averaged 9.5 µg/L at the surface, 15.0 µg/L at mid-depth, and 7.5 µg/L at the bottom.  The maximum surface chlorophyll was 66.0 µg/L on the morning of September 17^th.

Phillipsdale Landing

Sondes were swapped this week on the morning of September 9^th. 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, rising above the 20-year daily median. Surface salinity averaged 22.6 ppt and ranged from 15.1 ppt to 27.2 ppt. Bottom salinity averaged 25.9 ppt and ranged from 15.0 ppt to 29.5 ppt. Temperatures averaged 22.0°C at the surface and 22.2°C at the bottom. Surface temperatures ranged from 20.1°C to 24.2°C, while bottom temperatures ranged from 21.1°C to 23.2°C.

Dissolved oxygen (DO) at Phillipsdale Landing dropped below the hypoxia threshold (i.e., DO >2.9 mg/L) briefly at the start of the week. The longest periods of hypoxic conditions spanned 2.25 hours, occurring during the morning of September 8^th. During this period, the bottom DO averaged around 2.53 mg/L. Surface DO averaged 6.0 mg/L and ranged from 2.6 mg/L to 14.4 mg/L. Bottom DO concentrations averaged 4.3 mg/L and ranged from 2.3 mg/L to 9.3 mg/L. Chlorophyll readings decreased from last week, averaging 7.8 µg/L at the surface and 5.3 µg/L at the bottom. Maximum chlorophyll at the surface reached 60.8 µg/L on the afternoon of September 14^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 at Bullock Reach this week. Salinity averaged 28.9 ppt, 30.3 ppt, and 31.7 ppt at the surface, middle, and bottom sondes, respectively. Surface salinity ranged 27.3– 30.3 ppt, middle salinity ranged 28.3-31.4 ppt, and bottom salinity ranged 29.9 – 32.6 ppt. Surface temperature averaged 21.5°C and ranged from 20.5°C to 22.6°C. Middle temperatures averaged 21.4°C and ranged from 20.7°C to 22.8°C. Bottom temperatures averaged 21.2°C and ranged from 20.7°C to 22.5°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 6.8 mg/L and ranged 5.1 – 8.8 mg/L. Middle DO averaged 6.3 mg/L and ranged 4.9 – 8.5 mg/L. At the bottom, DO averaged 5.6 mg/L and ranged 4.6 – 7.4 mg/L.  Chlorophyll readings ranged from low to elevated throughout the week. Readings averaged 12.2 µg/L at the surface, 9.2 µg/L at the middle, and 3.76 µg/L at the bottom.  The maximum surface chlorophyll was 27.9 µg/L on the afternoon of September 9^th.

Phillipsdale Landing

Overall, the water quality at Phillipsdale Landing was fair this week. Weather conditions included frequent rain events this week, with 1.59 inches of precipitation recorded at T.F. Green. The Blackstone River had a low flow throughout the week, remaining below the 20-year daily median throughout the week.  Surface salinity averaged 21.3 ppt and ranged from 12.4 ppt to 25.9 ppt. At the bottom, salinity averaged 25.8 ppt and ranged from 17.9 ppt to 30.2 ppt. Temperatures averaged 23.1°C at the surface and 23.0°C at the bottom. Surface temperatures ranged from 20.9°C to 24.8°C, while bottom temperatures ranged from 21.8°C to 24.4°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 11 hours, occurring at the bottom depth from the night of September 2^nd until September 3^rd. During this period, the bottom DO averaged around 1.02 mg/L. Surface DO averaged 8.0 mg/L and ranged from 2.6 mg/L to 16.6 mg/L. Bottom DO concentrations averaged 3.7 mg/L and ranged from 0.1 mg/L to 11.0 mg/L. Chlorophyll readings decreased from last week, averaging 36.3 µg/L at the surface and 39.0 µg/L at the bottom. Maximum chlorophyll at the surface reached 121.7 µg/L on the morning of September 1^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 September 4^th. Overall, water quality was good at Bullock Reach this week. Salinity averaged 29.5 ppt, 30.8 ppt, and 32.2 ppt at the surface, middle, and bottom sondes, respectively. Surface salinity ranged 26.8– 30.7 ppt, mid salinity ranged 28.4 – 31.8 ppt, and bottom salinity ranged 30.2 – 33.3 ppt. Surface temperature averaged 22.2°C and ranged from 21.0°C to 23.4°C. Mid temperatures averaged 22.1°C and ranged from 21.2°C to 23.1°C. Bottom temperatures averaged 21.6°C and ranged from 20.5°C to 23.0°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 7.3 mg/L and ranged 6.0 – 10.0 mg/L. In the mid waters, DO averaged 6.0 mg/L and ranged 4.0 – 8.7 mg/L. At the bottom, DO averaged 5.0 mg/L and ranged 3.2 – 6.7 mg/L.  Chlorophyll readings ranged from low to elevated throughout the week. Readings averaged 9.6 µg/L at the surface, 11.0 µg/L at mid-depth, and 4.8 µg/L at the bottom.  The maximum surface chlorophyll was 26.8 µg/L on the morning of September 6^th.

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.