Thoreau wrote that as a child of four, his family had picnicked at Walden, making a beach fire on a sandy spit of land not far from where he would build his cabin for his two-year sojourn in Walden Woods. Early in 1846 he drilled more than 70 holes in the ice in an attempt to locate the pond’s deepest point. He reported depth at 102 feet, but to today’s topic, the picnic location was at that time under seven feet of water.
|Circles show height of water measured in feet above 'sea level' (see scale on right side). The long-term average is|
158 feet. Prolonged droughts cause dips. Extreme amounts of rain in a short period of time cause spikes.
*http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0191755 Stager JC, et al. Climate variability and cultural eutrophication at Walden Pond (Massachusetts, USA) during the last 1800 years PLoS One. 13(4): e0191755.