Outer Island Pier Water Quality (2020)

          Water quality parameters were monitored by the CSU interns during the summer 2020 from June 24^th to August 8^th. 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.

          With one exception, salinity showed little variability, with a range of only 29.2 ppt (6/24) to 30.3 ppt (8/8), while conductivity showed a slightly larger range from 40.38 mS (6/30) to 46.60 mS (7/29) (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 19.9°C (6/26) to a high of 25.2°C (8/8). Variations in water temperature over the summer correlated well with changes in measured air temperature (Figure 2). Dissolved oxygen concentrations were highest initially (10.38 mg/L) on 6/24 and showed a decrease over the summer months correlating with increasing temperatures reaching a low of 6.90 mg/L on 8/6 (Figure lb).

          Water clarity, as measured by a Secchi disk, varied from 0.7 m (6/10) to 1.6 m (7/17) during the monitoring period (Figure 2a).  pH ranged from a low of 7.82 (7/13) to a high of 8.32 (9/20) (Figure 2b). Similar to other parameters this season, water clarity/turbidity and pH showed less variation than previous years. 

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