The following graphs show the vertical profiles for several measures of water quality. The data used in these graphs is collected from buoys deployed near Mansfield Dam at Lake Travis and near Wirtz Dam at Lake LBJ. Measurements are taken twice a day (at midnight and noon). Graphs are updated daily by 4 AM and 4 PM.

Profiles are graphs of water quality data that show the values for a given parameter at all depths on the same graph. In these graphs, the line that makes up the profile is actually several individual measurements taken at each meter in the lake.

The temperature graph is the water temperature in degrees Fahrenheit. Water temperature plays an important role in the metabolism of aquatic organisms and in the amount of oxygen water can hold. Expected temperature ranges are between 50 and 95 °F.

The pH graph shows the water pH from top to bottom. pH is a measure of the acidity of water. Our lakes are considered slightly alkaline, with a pH between 7.5 and 8.5.

The dissolved oxygen graph gives you the amount of oxygen dissolved in the water. Dissolved oxygen is measured in parts per million (ppm) or mg/l. DO values can vary between 0 and 15. It is typical for the upper depths of the lake to have more oxygen than the bottom, especially in the summer and fall months.

The specific conductivity graph provides information on the electrical conductivity of the water. It is useful in determining the amount of dissolved particles in the water. It is measured in microSiemens per centimeter (µS/cm) or micromhos per centimeter (µmho/cm). Expected range is between 200 and 500 µS/cm.