Long Lake High Resolution Temperature Monitoring Main Basin

Unfortunately, LEA’s temperature sensors were lost or taken in early September at this site. This year’s heat map was generated using data collected during regular testing visits. The black dots on top of the heat map represent individual readings collected at each visit. The water column of Long Lake’s middle basin was already weakly stratified at our first visit in May. Surface water temperatures increased gradually until reaching peak temperature of 26.5 °C (79.7 °F) in late July before beginning a gradual decline that persisted for the remainder of the season. Shallow waters began to cool and mix with waters from the middle depths in early September. Temperature differences in the deep-waters indicate that full mixing had not yet occurred at the time of our last visit in late September.