Outer Island Pier Water Quality (2022)

          Water quality parameters were monitored by the CSU interns during the summer 2022 from May 31st to August 5th. Water quality monitoring occurred each day at 2:00 pm from the end of the floating dock. Water quality parameters monitored included: water temperature, salinity, conductivity, specific conductance, dissolved oxygen, Secchi disk depth, turbidity, and pH. All measurements were made on water samples collected from at a depth of one meter.

          Salinity measurements showed little variability, with a range of only 26.5 ppt (5/31) to 29.0 ppt (7/17), while conductivity showed a slightly larger range from 34.70 mS (5/31) to 44.07 mS (7/23) (Figure la). Both parameters showed similar variability compared to previous years. Water temperature gradually increased from the spring to the end of the summer. Water temperature ranged from 16.7°C (5/31) to a high of 25.3°C (8/4). Variations in water temperature over the summer correlated well with changes in measured air temperature (Figure 2). Dissolved oxygen concentrations were highest initially (8.82 mg/L) on 5/31 and showed a decrease over the summer months correlating with increasing temperatures reaching a low of 6.38 mg/L on 7/26 (Figure lb).

          Water clarity, as measured by a Secchi disk, varied from 0.8 m (7/7) to 1.6 m (8/2) during the monitoring period (Figure 3a). pH ranged from a low of 7.92 (7/31) to a high of 8.15 (8/4) (Figure 3b). Like other parameters this season, water clarity/turbidity and pH showed less variation than previous years.

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