If the 30-day moving average line is below the red band, does that mean that the water level is the lowest its ever been?
Not, necessarily, but it does mean that it is the lowest 30-day average ever recorded. The percentile color bands, as well as the current conditions are based on 30-day moving averages – not instantaneous readings. The data presented on this web site do not show record instantaneous extremes. Instantaneous readings can be viewed by clicking on the link to ‘Real-Time Graph’ at the bottom of each graph.