8646-R1_NewGloucester_2022-2023_AnnualReport_Web

2023 Sabbathday Lake Water Quality Report

LIST OF FIGURES Figure 1. Sabbathday Lake bathymetric map showing deep hole sampling location (Station 1). ................................................................................................................................................................................. ii Figure 2. Total and monthly precipitation for Sabbathday Lake from May-September, 2014 2023. ........................................................................................................................................................................... 3 Figure 3. Average annual water clarity for Sabbathday Lake, Station 1 (1975-2023) ................. 4 Figure 4. Average annual water quality data for trophic state indicators (water clarity, total phosphorus (TP), and Chlorophyll-a (Chl-a) for Sabbathday Lake, Station 1.................................. 6 Figure 5. 2023 dissolved oxygen profiles for Sabbathday Lake, Station 1...................................... 7 Figure 6. 2023 temperature profiles for Sabbathday Lake, Station 1. .............................................. 7 LIST OF TABLES Table 1. Average annual water clarity for Sabbathday Lake at Station 1 (1975-2023)............... 3 Table 2. Average Annual TP for Sabbathday Lake, Station 1 (1982-2023)...................................... 5 Table 3. Average Annual Chl-a for Sabbathday Lake, Station 1 (1975-2023). ............................... 5 Table 4. Average annual color for Sabbathday Lake, Station 1 (1982-2023). ................................ 8 Table 5. Average annual alkalinity for Sabbathday Lake, Station 1 (1982-2023).......................... 8 Table 6. Average annual pH for Sabbathday Lake, Station 1 (1982-2023). .................................... 9 Table 7. Summary of 2023 data and historical averages for water clarity, total phosphorus (TP), chlorophyll a (Chl-a), color, alkalinity, and pH at Sabbathday Lake........................................10

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