Fixed-Site Network

Walker Point

Overall, water quality at Walker Point was poor to good this week. Weather conditions were moderately rainy this week, with a total of 1.33 inches recorded at T.F. Green, and the majority of rainfall occurring on the 21^st.  Blackstone River flow was highest on August August 23^rd, where the flow slightly exceeded the 20-year daily median flow. Flow previous in the week was below the 20-year daily median value. Salinity at the surface averaged 20.6 ppt and ranged from 13.8 ppt to 27.4 ppt. At the bottom, salinity averaged 27.8 ppt and ranged from 24.1 ppt to 30.4 ppt. Temperatures this week averaged 23.9 °C at the surface and 24.0 °C at the bottom. Surface temperatures ranged from 21.7  °C to 26.3°C, while bottom temperatures ranged from 22.2 °C to 25.1 °C.

Dissolved oxygen (DO) at Walker Point remained above the hypoxia threshold (i.e., DO >2.9 mg/L) at the surface for most of the week, but below the hypoxia threshold at the bottom for much of the time, especially towards the beginning of the week. Hypoxic conditions were observed at the surface briefly during the mornings of August 19^th, August 22^nd, and August 23^rd, August 15^th, and August 16^th, with a more extended hypoxic period was observed on the morning of August 18^th, lasting approximately 2.5 hours. Hypoxic conditions were observed at the bottom for almost the entirety of August 18^th – 24^th, and in intermittent periods on August 17^th. Surface DO averaged 7.3 mg/L and ranged from 1.2 to 20.4 mg/L. Bottom water DO concentration averaged 1.0 mg/L and ranged from 0 mg/L to 4.2 mg/L. Chlorophyll ranged from low to very elevated levels throughout the week, averaging 26.7 ug/L at the surface and 22.4 ug/L at the bottom, with evidence of substantial phytoplankton blooms occurring throughout the week. Maximum surface chlorophyll readings reached 467.0 ug/L on the afternoon of August 23^rd. 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 August 18^th. Overall, water quality ranged from poor to good at Bullock Reach this week. Salinity averaged 27.6 ppt, 29.3 ppt, and 31.2 ppt at the surface, middle, and bottom sondes, respectively. Surface salinity ranged from 25.8 to 29.4 ppt, mid salinity ranged from 27.6 to 31.1 ppt, and bottom salinity ranged from 26.5 to 32.4 ppt. Surface temperature averaged 24.0 °C and ranged from 22.0 °C to 25.9 °C. Mid temperatures averaged 23.6 °C and ranged from 22.0 °C to 25.2 °C. Bottom temperatures averaged 22.5 °C and ranged from 20.5 °C to 24.1 °C.

DO at Bullock Reach experienced hypoxic conditions (i.e., DO < 2.9 mg/L) intermittently in both middle and bottom waters. Surface DO averaged 6.2 mg/L and ranged from 3.1 to 10.8 mg/L. In the mid waters, DO averaged 4.9 mg/L and ranged from 2.6 to 7.7 mg/L. At the bottom, DO averaged 3.7 mg/L and ranged 2.3 to 5.5 mg/L.  Chlorophyll readings ranged from low to moderate, with evidence of moderate phytoplankton blooms occurring throughout the week. Readings averaged 9.2 µg/L at the surface, 10.9 µg/L at mid-depth, and 3.5 µg/L at the bottom.  The maximum surface chlorophyll was 31.7 µg/L on the afternoon of August 17^th.

Walker Point

Sondes were swapped this week on August 12^th. Overall, water quality at Walker Point was poor to good this week. Weather conditions were mildly rainy this week, with a total of 0.26 inches recorded at T.F. Green, and the majority of rainfall occurring on the 13^rd.  Blackstone River flow was highest on August 10^th, where the flow slightly exceeded the 20-year daily median flow, and flow declined over the rest of the week, falling below the 20-year daily median value. Salinity at the surface averaged 21.8 ppt and ranged from 11.0 ppt to 27.9 ppt. At the bottom, salinity averaged 26.5 ppt and ranged from 23.4 ppt to 28.5 ppt. Temperatures this week averaged 25.3 °C at the surface and 24.7 °C at the bottom. Surface temperatures ranged from 23.2  °C to 27.7 °C, while bottom temperatures ranged from 23.8 °C to 25.8 °C.

Dissolved oxygen (DO) at Walker Point remained above the hypoxia threshold (i.e., DO >2.9 mg/L) at the surface, but below the hypoxia threshold at the bottom for much of the time, especially towards the beginning of the week. Hypoxic conditions were observed at the surface briefly during the mornings of August 10^th, August 12^th, August 14^th, August 15^th, and August 16^th. Hypoxic conditions were observed at the bottom for almost the entirety of August 10^th and 11^th, and in intermittent periods for the rest of the week. Surface DO averaged 7.3 mg/L and ranged from 2.5 to 15.6 mg/L. Bottom water DO concentration averaged 2.7 mg/L and ranged from 0.1 mg/L to 8.4 mg/L. Chlorophyll ranged from low to elevated levels throughout the week, averaging 12.2 ug/L at the surface and 16.4 ug/L at the bottom, with evidence of substantial phytoplankton blooms occurring throughout the week. Maximum surface chlorophyll readings reached 113.0 ug/L on the afternoon of August 13^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 poor to good at Bullock Reach this week. Salinity averaged 27.2 ppt, 29.5 ppt, and 31.5 ppt at the surface, middle, and bottom sondes, respectively. Surface salinity ranged from 22.1 to 29.1 ppt, mid salinity ranged from 26.7 to 31.1 ppt, and bottom salinity ranged from 28.2 to 32.4 ppt. Surface temperature averaged 25.3 °C and ranged from 24.0 °C to 27.2 °C. Mid temperatures averaged 24.4 °C and ranged from 23.1 °C to 26.0 °C. Bottom temperatures averaged 23.3 °C and ranged from 22.3 °C to 24.8 °C.

DO at Bullock Reach experienced hypoxic conditions (i.e., DO < 2.9 mg/L) towards the beginning of  the week in both middle and bottom waters. Surface DO averaged 7.2 mg/L and ranged from 3.8 to 11.3 mg/L. In the mid waters, DO averaged 4.4 mg/L and ranged from 1.6 to 8.2 mg/L. At the bottom, DO averaged 3.2 mg/L and ranged 2.0 to 5.7 mg/L.  Chlorophyll readings ranged from low to moderate, with evidence of moderate phytoplankton blooms occurring throughout the week. Readings averaged 12.3 µg/L at the surface, 11.6 µg/L at mid-depth, and 6.7 µg/L at the bottom.  The maximum surface chlorophyll was 44.7 µg/L on the afternoon of August 12^th.

Walker Point

Overall, water quality at Walker Point was poor this week. Weather conditions were rainy this week, with a total of 2.52 inches recorded at T.F. Green, and the majority of rainfall occurring on the 3^rd.  Blackstone River flow reached its peak on August 4^th, where the flow greatly exceeded the 20-year daily median flow, and flow remained above the 20-year daily median value for the rest of the week.   Salinity at the surface averaged 11.3 ppt and ranged from 3.6 ppt to 22.5 ppt. At the bottom, salinity averaged 24.3 ppt and ranged from 18.4 ppt to 28.5 ppt. Temperatures this week averaged 26.0 °C at the surface and 24.4 °C at the bottom. Surface temperatures ranged from 23.7  °C to 29.8 °C, while bottom temperatures ranged from 23.7 °C to 25.4 °C.

Dissolved oxygen (DO) at Walker Point 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 August 3^rd. Hypoxic conditions were observed at the bottom for almost the entire week. Surface DO averaged 9.5 mg/L and ranged from 2.8 to 19.3 mg/L. Bottom water DO concentration averaged 1.6 mg/L and ranged from 0.1 mg/L to 3.9 mg/L. Chlorophyll ranged from low to elevated levels throughout the week, averaging 18.0 ug/L at the surface and 3.5 ug/L at the bottom, with evidence of substantial phytoplankton blooms occurring throughout the week. Maximum surface chlorophyll readings reached 157.4 ug/L on the morning of August 9^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 August 4^th. Overall, water quality ranged from fair to good at Bullock Reach this week. Salinity averaged 23.8 ppt, 28.0 ppt, and 31.1 ppt at the surface, middle, and bottom sondes, respectively. Surface salinity ranged from 19.9 to 28.7 ppt, mid salinity ranged from 24.1 to 31.0 ppt, and bottom salinity ranged from 28.7 to 32.3 ppt. Surface temperature averaged 26.1 °C and ranged from 24.1 °C to 28.5 °C. Mid temperatures averaged 24.7 °C and ranged from 23.1 °C to 27.0 °C. Bottom temperatures averaged 23.2 °C and ranged from 22.3 °C to 24.7 °C.

DO at Bullock Reach experienced hypoxic conditions (i.e., DO < 2.9 mg/L) towards the end of  the week in both middle and bottom waters. Surface DO averaged 8.1 mg/L and ranged from 4.9 to 14.2 mg/L. In the mid waters, DO averaged 4.9 mg/L and ranged from 1.1 to 8.4 mg/L. At the bottom, DO averaged 3.6 mg/L and ranged 1.8 to 7.4 mg/L.  Chlorophyll readings ranged from low to moderate, with evidence of moderate phytoplankton blooms occurring throughout the week. Readings averaged 15.5 µg/L at the surface, 14.8 µg/L at mid-depth, and 4.9 µg/L at the bottom.  The maximum surface chlorophyll was 37.2 µg/L on the afternoon of August 5^th.

Walker Point

Sondes were swapped this week on July 28^th. Overall, water quality at Walker Point was poor this week. Weather conditions were rainy this week, with a total of 1.25 inches recorded at T.F. Green, and the majority of rainfall occurring on the 29^th.  Blackstone River flow reached its peak on July 30^th, where the flow greatly exceeded the 20-year daily median flow, and flow remained above the 20-year daily median value for the rest of the week.   Salinity at the surface averaged 17.7 ppt and ranged from 7.5 ppt to 27.4 ppt. At the bottom, salinity averaged 26.7 ppt and ranged from 21.6 ppt to 29.4 ppt. Temperatures this week averaged 24.2 °C at the surface and 26.2 °C at the bottom. Surface temperatures ranged from 22.4  °C to 26.2 °C, while bottom temperatures ranged from 22.6 °C to 24.6 °C.

Dissolved oxygen (DO) at Walker Point remained above the hypoxia threshold (i.e., DO >2.9 mg/L) at the surface, but below the hypoxia threshold at the bottom for a substantial portion of the week. Hypoxic conditions were observed at the bottom for most of July 27^th, 28^th, August 1^st, and August 2^nd. Hypoxic conditions occurred intermittently on other days of the week. Surface DO averaged 7.7 mg/L and ranged from 3.5 to 15.1 mg/L. Bottom water DO concentration averaged 2.5 mg/L and ranged from 0.5 mg/L to 6.1 mg/L. Chlorophyll ranged from low to elevated levels throughout the week, averaging 16.2 ug/L at the surface and 5.6 ug/L at the bottom, with evidence of moderate phytoplankton blooms occurring throughout the week. Maximum surface chlorophyll readings reached 66.4 ug/L on the afternoon of August 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 August 4^th. Overall, water quality ranged from por to good at Bullock Reach this week. Salinity averaged 27.9 ppt, 29.5 ppt, and 31.0 ppt at the surface, middle, and bottom sondes, respectively. Surface salinity ranged from 24.9 to 29.6 ppt, mid salinity ranged from 29.5 to 31.5 ppt, and bottom salinity ranged from 27.3 to 32.5 ppt. Surface temperature averaged 23.9 °C and ranged from 22.8 °C to 25.4 °C. Mid temperatures averaged 23.5 °C and ranged from 21.5 °C to 24.8 °C. Bottom temperatures averaged 22.5 °C and ranged from 20.2 °C to 24.1 °C. DO at Bullock Reach experienced hypoxic conditions (i.e., DO < 2.9 mg/L) towards the beginning of  the week in bottom waters, but otherwise did not experience hypoxic conditions. Surface DO averaged 7.2 mg/L and ranged from 5.0 to 11.4 mg/L. In the mid waters, DO averaged 5.9 mg/L and ranged from 3.3 to 9.1 mg/L. At the bottom, DO averaged 4.3 mg/L and ranged 2.2 to 7.6 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, 13.0 µg/L at mid-depth, and 4.5 µg/L at the bottom.  The maximum surface chlorophyll was 26.8 µg/L on the afternoon of August 2^nd.

Walkers Point

Overall, the water quality at Walkers Point was good to fair this week. Weather conditions were dry this week, except for 1.88 inches of precipitation recorded at T.F. Green on July 25^th.  Surface salinity averaged 15.9 ppt and ranged from 6.3 ppt to 27.4 ppt. At the bottom, salinity averaged 26.4 ppt and ranged from 21.8 ppt to 29.5 ppt. Temperatures averaged 24.2°C at the surface and 23.7°C at the bottom. Surface temperatures ranged from 22.3°C to 26.7°C, while bottom temperatures ranged from 22.8°C to 24.3°C.

Dissolved oxygen (DO) at Walkers Point remained above the hypoxia threshold (i.e., DO>2.9mg/L) at the surface but dropped below at the bottom depth. The longest periods of hypoxic conditions spanned 49 hours and 46 minutes, occurring at the bottom depth between the evening of July 23^rd and July 25^th. During this period, the DO averaged around 1.59 mg/L. Surface DO averaged 10.4 mg/L and ranged from 4.7 mg/L to 18.7 mg/L. Bottom DO concentrations averaged 2.6 mg/L and ranged from 0.2 mg/L to 6.0 mg/L. Chlorophyll readings averaged 22.0 µg/L at the surface and 12.4µg/L at the bottom. Maximum chlorophyll at the surface reached 92.6 µg/L on the morning of July 24^th.

Bullock Reach

Sondes were swapped this week on the morning of July 23^rd. Overall, water quality was good to fair at Bullock Reach this week. Salinity averaged 27.6 ppt, 29.4 ppt, and 30.3 ppt at the surface, middle, and bottom sondes, respectively. Surface salinity ranged 24.8 – 29.6 ppt, middle salinity range 26.1 – 31.2 ppt, and bottom salinity ranged 14.5 – 31.7 ppt. Surface temperature averaged 23.9°C and ranged from 22.9°C to 25.5°C. Middle temperature averaged 23.5°C and ranged from 22.0°C to 25.1°C. Bottom temperatures averaged 22.9°C and ranged from 22.0°C to 23.7°C.

Dissolved oxygen (DO) at Bullock Reach remained above the hypoxia threshold (i.e., DO>2.9mg/L) at all the depths. Surface DO averaged 9.3 mg/L and ranged 5.7 – 15.0 mg/L. Middle DO averaged 6.8 mg/L and ranged 4.1 – 11.7 mg/L. At the bottom, DO averaged 5.24 mg/L and ranged 3.79 – 7.22 mg/L.  Chlorophyll readings ranged from low to elevated throughout the week. Readings averaged 13.2 µg/L at the surface, 16.5 µg/L at the middle, and 6.87 µg/L at the bottom.  The maximum surface chlorophyll was 29.6 µg/L on the night of July 23^rd.

Walkers Point

Sondes were swapped this week on the morning of July 14^th (surface sonde) and 15^th (bottom sonde). Overall, the water quality at Walkers Point was good to fair this week. Weather conditions included light rain events this week, with 0.69 inches of precipitation recorded at T.F. Green. Surface salinity averaged 21.6 ppt and ranged from 10.3 ppt to 28.3 ppt. At the bottom, salinity averaged 25.6 ppt and ranged from 20.5 ppt to 28.7 ppt. Temperatures averaged 24.2°C at the surface and 23.8°C at the bottom. Surface temperatures ranged from 22.9°C to 26.5°C, while bottom temperatures ranged from 22.6°C to 24.7°C.

Dissolved oxygen (DO) at Walkers Point remained above the hypoxia threshold (i.e., DO>2.9mg/L) at the surface, but dropped below the hypoxia threshold at the bottom depth. The longest periods of hypoxic conditions spanned 7 hours and 45 minutes, occurring at the bottom depth on the morning of July 16^th. During this period, the DO averaged around 2.05 mg/L. Surface DO averaged 6.9 mg/L and ranged from 3.2 mg/L to 14.5 mg/L. Bottom DO concentrations averaged 3.6 mg/L and ranged from 0.1 mg/L to 7.1 mg/L. Chlorophyll readings averaged 13.6 µg/L at the surface and 12.7 µg/L at the bottom. Maximum chlorophyll at the surface reached 94.8 µg/L on the afternoon of July 14^th.

Bullock Reach

Overall, water quality was good to fair at Bullock Reach this week. Salinity averaged 28.2 ppt, 29.9 ppt, and 31.0 ppt at the surface, middle, and bottom sondes, respectively. Surface salinity ranged 26.1 – 29.9 ppt, middle salinity range 27.6 – 30.9 ppt, and bottom salinity ranged 17.7 – 31.9 ppt. Surface temperature averaged 24.1°C and ranged from 23.1°C to 25.5°C. Middle temperature averaged 23.6°C and ranged from 22.7°C to 24.6°C. Bottom temperatures averaged 22.9°C and ranged from 20.5°C to 24.0°C.

Dissolved oxygen (DO) at Bullock Reach remained above the hypoxia threshold (i.e., DO>2.9mg/L) at the at all depths this week. Surface DO averaged 7.8 mg/L and ranged 5.1 – 11.4 mg/L. Middle DO averaged 6.2 mg/L and ranged 4.4 – 10.2 mg/L. At the bottom, DO averaged 5.2 mg/L and ranged 3.2 – 7.5 mg/L.  Chlorophyll readings ranged from low to elevated throughout the week. Readings averaged 13.8 µg/L at the surface, 15.4 µg/L at the middle, and 12.5 µg/L at the bottom.  The maximum surface chlorophyll was 30.2 µg/L on the afternoon of July 17^th.

Walkers Point

Overall, the water quality at Walkers Point was good to fair this week. Weather conditions were wet this week, with 2.63 inches of precipitation recorded at T.F. Green.  Surface salinity averaged 16.9 ppt and ranged from 4.5 ppt to 27.4 ppt. At the bottom, salinity averaged 27.4 ppt and ranged from 23.5 ppt to 30.3 ppt. Temperatures averaged 24.0°C at the surface and 22.2°C at the bottom. Surface temperatures ranged from 21.5°C to 27.6°C, while bottom temperatures ranged from 20.7°C to 24.2°C.

Dissolved oxygen (DO) at Walkers Point remained above the hypoxia threshold (i.e., DO>2.9mg/L) at the surface but dropped below at the bottom depth. The longest periods of hypoxic conditions spanned 21 hours and 46 minutes, occurring at the bottom depth on the night of July 8^th to the morning of July 9^th. During this period, the DO averaged around 1.91 mg/L. Surface DO averaged 8.6 mg/L and ranged from 3.3 mg/L to 19.1 mg/L. Bottom DO concentrations averaged 2.3 mg/L and ranged from 0.1 mg/L to 4.5 mg/L. Chlorophyll readings averaged 14.5 µg/L at the surface and 4.6 µg/L at the bottom. Maximum chlorophyll at the surface reached 142.4 µg/L on the afternoon of July 7^th.

Bullock Reach

Sondes were swapped this week on the morning of July 7^th. Overall, water quality was good to fair at Bullock Reach this week. Salinity averaged 27.8 ppt, 29.9 ppt, and 31.8 ppt at the surface, middle, and bottom sondes, respectively. Surface salinity ranged 24.0 – 30.2 ppt, middle salinity range 27.0 – 31.7 ppt, and bottom salinity ranged 30.5 – 32.8 ppt. Surface temperature averaged 23.7°C and ranged from 21.5°C to 25.8°C. Middle temperature averaged 22.7°C and ranged from 19.8°C to 24.4°C. Bottom temperatures averaged 20.7°C and ranged from 18.7°C to 23.1°C.

Dissolved oxygen (DO) at Bullock Reach remained above the hypoxia threshold (i.e., DO>2.9mg/L) at the surface and middle depths, but dropped below the hypoxia threshold at the bottom depth. The longest period of hypoxic conditions at the bottom depth spanned 5 hours and 15 minutes, occurring on the night of July 6^th to the morning of July 7^th.  During this period, the bottom DO averaged around 2.64 mg/L. Surface DO averaged 7.7 mg/L and ranged 4.7 – 13.3 mg/L. Middle DO averaged 6.0 mg/L and ranged 3.7 – 8.5 mg/L. At the bottom, DO averaged 4.2 mg/L and ranged 2.1 – 6.6 mg/L.  Chlorophyll readings ranged from low to elevated throughout the week. Readings averaged 11.5 µg/L at the surface, 14.4 µg/L at the middle, and 10.1 µg/L at the bottom.  The maximum surface chlorophyll was 24.6 µg/L on the night of July 10^th.

Walkers Point

Sondes were swapped this week on the morning of June 30^th. Overall, the water quality at Walkers Point was good to fair this week. Weather conditions included light rain events this week, with 0.26 inches of precipitation recorded at T.F. Green. Surface salinity averaged 20.6 ppt and ranged from 10.6 ppt to 28.9 ppt. At the bottom, salinity averaged 26.3 ppt and ranged from 24.1 ppt to 29.1 ppt. Temperatures averaged 25.8°C at the surface and 22.5°C at the bottom. Surface temperatures ranged from 22.0°C to 30.1°C, while bottom temperatures ranged from 20.9°C to 24.0°C.

Dissolved oxygen (DO) at Walkers Point dropped below the hypoxia threshold (i.e., DO>2.9mg/L) at both the surface and bottom depths. The longest periods of hypoxic conditions spanned 5 hours, occurring at the bottom depth on the morning of June 29^th. During this period, the DO averaged around 2.33 mg/L. Surface DO averaged 10.2 mg/L and ranged from 2.5 mg/L to 24.5 mg/L. Bottom DO concentrations averaged 4.2 mg/L and ranged from 1.9 mg/L to 7.7 mg/L. Chlorophyll readings averaged 21.0 µg/L at the surface and 9.9 µg/L at the bottom. Maximum chlorophyll at the surface reached 195.5 µg/L on the morning of July 1^st.

Bullock Reach

Overall, water quality was good to fair at Bullock Reach this week. Salinity averaged 28.3 ppt, 30.2 ppt, and 31.9 ppt at the surface, middle, and bottom sondes, respectively. Surface salinity ranged 26.1 – 29.8 ppt, middle salinity range 28.0 – 31.7 ppt, and bottom salinity ranged 30.3 – 32.7 ppt. Surface temperature averaged 25.3°C and ranged from 23.5°C to 27.7°C. Middle temperature averaged 23.7°C and ranged from 21.4°C to 26.4°C. Bottom temperatures averaged 20.7°C and ranged from 18.1°C to 23.9°C.

Dissolved oxygen (DO) at Bullock Reach remained above the hypoxia threshold (i.e., DO>2.9mg/L) at the surface, but dropped below the hypoxia threshold at the middle and bottom depths. The middle depth had a brief drop into hypoxic conditions on the morning of July 4^th for two 15-minute intervals. The longest period of hypoxic conditions at the bottom depth spanned 12 hours and 15 minutes, spanning the night of June 29^th to the morning of June 30^th.  During this period, the bottom DO averaged around 2.73 mg/L. Surface DO averaged 7.8 mg/L and ranged 4.4 – 12.8 mg/L. Middle DO averaged 5.9 mg/L and ranged 2.7 – 9.5 mg/L. At the bottom, DO averaged 3.4 mg/L and ranged 2.3 – 6.0 mg/L.  Chlorophyll readings ranged from low to elevated throughout the week. Readings averaged 3.2 µg/L at the surface, 15.5 µg/L at the middle, and 12.2 µg/L at the bottom.  The maximum bottom chlorophyll was 41.1 µg/L on the morning of July 2^nd.

Walkers Point

Overall, the water quality at Walkers Point was good to fair this week. Weather conditions included light rain events this week, with 2.09 inches of precipitation recorded at T.F. Green. Surface salinity averaged 20.5 ppt and ranged from 10.0 ppt to 27.5 ppt. At the bottom, salinity averaged 20.5 ppt and ranged from 10.0 ppt to 27.5 ppt. Temperatures averaged 22.4°C at the surface and 21.3°C at the bottom. Surface temperatures ranged from 20.8°C to 25.7°C, while bottom temperatures ranged from 20.1°C to 22.6°C.

Dissolved oxygen (DO) at Walkers Point 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 20.25 hours, occurring at the bottom depth from the night of June 24^th to the afternoon of June 25^th. During this period, the DO averaged around 2.46 mg/L. Surface DO averaged 7.0 mg/L and ranged from 3.5 mg/L to 12.8 mg/L. Bottom DO concentrations averaged 3.0 mg/L and ranged from 1.2 mg/L to 5.2 mg/L. Chlorophyll readings averaged 10.34 µg/L at the surface and 3.43 µg/L at the bottom. Maximum chlorophyll at the surface reached 37.45 µg/L on the afternoon of June 27^th.

Please note that DCP connection issues are ongoing during this deployment and data will be updated once deployment is retrieved.

Bullock Reach

Sondes were swapped this week on the morning of June 24^th. Overall, water quality was good to fair at Bullock Reach this week. Salinity averaged 28.8 ppt, 30.0 ppt, and 20.6 ppt at the surface, middle, and bottom sondes, respectively. Surface salinity ranged 26.6 – 30.1 ppt, middle salinity range 28.1 – 31.6 ppt, and bottom salinity ranged 30.52 – 32.8 ppt. Surface temperature averaged 22.1°C and ranged from 20.8°C to 24.7°C. Middle temperature averaged 21.4°C and ranged from 19.6°C to 23.4°C. Bottom temperatures averaged 19.3°C and ranged from 18.1°C to 22.1°C.

Dissolved oxygen (DO) at Bullock Reach remained above the hypoxia threshold (i.e., DO>2.9mg/L) at the surface and middle depths, but dropped below the hypoxia threshold at the bottom depth. The longest periods of hypoxic conditions spanned 1 hours, occurring at the bottom depth from the night of June 28^th.  During this period, the bottom DO averaged around 2.82 mg/L. Surface DO averaged 7.5 mg/L and ranged 5.8 – 10.2 mg/L. Middle DO averaged 6.2 mg/L and ranged 4.1 – 8.2 mg/L. At the bottom, DO averaged 4.5 mg/L and ranged 2.6 – 8.1 mg/L.  Chlorophyll readings ranged from low to elevated throughout the week. Readings averaged 10.7 µg/L at the surface, 13.3 µg/L at the middle, and 12.7 µg/L at the bottom.  The maximum bottom chlorophyll was 45.7 µg/L on the morning of June 26^th.

Walkers Point

Sondes were swapped this week on the morning of June 16^th. Overall, the water quality at Walkers Point was good to fair this week. Weather conditions were dry this week, with 0.03 inches of precipitation recorded at T.F. Green. Surface salinity averaged 22.7 ppt and ranged from 15.4 ppt to 28.0 ppt. At the bottom, salinity averaged 26.3 ppt and ranged from 21.9 ppt to 29.3 ppt. Temperatures averaged 22.1°C at the surface and 21.5°C at the bottom. Surface temperatures ranged from 20.1°C to 24.8°C, while bottom temperatures ranged from 20.2°C to 23.3°C.

Dissolved oxygen (DO) at Walkers Point 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 1.5 hours, occurring at the bottom depth from the morning of June 21^st.  During this period, the bottom DO averaged around 2.79 mg/L. Surface DO averaged 7.0 mg/L and ranged from 4.8 mg/L to 14.4 mg/L. Bottom DO concentrations averaged 5.0 mg/L and ranged from 2.6 mg/L to 8.2 mg/L. Chlorophyll readings averaged 11.16 µg/L at the surface and 6.4 µg/L at the bottom. Maximum chlorophyll at the bottom reached 42.4 µg/L on the evening of June 17^th.

Bullock Reach

Overall, water quality was good at Bullock Reach this week. Salinity averaged 29.3 ppt, 29.5 ppt, and 29.9 ppt at the surface, middle, and bottom sondes, respectively. Surface salinity ranged 27.8 – 30.5 ppt, middle salinity range 27.8 – 30.4 ppt, and bottom salinity ranged 28.8 – 30.7 ppt. Surface temperature averaged 21.4°C and ranged from 20.6°C to 22.8°C. Middle temperature averaged 20.9°C and ranged from 19.4°C to 22.0°C. Bottom temperatures averaged 20.1°C and ranged from 18.4°C to 21.6°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 7.36 mg/L and ranged 5.81 – 9.18 mg/L. Middle DO averaged 6.80 mg/L and ranged 4.93 – 8.48 mg/L. At the bottom, DO averaged 6.47 mg/L and ranged 4.51 – 8.52 mg/L.  Chlorophyll readings ranged from low to elevated throughout the week. Readings averaged 9.52 µg/L at the surface, 12.99 µg/L at the middle, and 13.06 µg/L at the bottom.  The maximum bottom chlorophyll was 48.44 µg/L on the evening of June 16^th.