Everything about Lake Manly totally explained
Lake Manly was a large
freshwater lake which filled the
Death Valley (
United States) basin prior to the dry climatic period which has prevailed since the last
ice age. Lake Manly receded due to increased evaporation, and to isolation from the
Colorado River system, to which it was once connected. At its greatest extent Lake Manly was roughly 80 miles long and 800 feet deep.
As Lake Manly evaporated to the surface of Death Valley, it left a remarkable legacy. Under the surface of Death Valley is one of the world's largest underground reservoirs (
aquifers). Being fed by the
Amargosa River and Salt Creek, this aquifer is barely visible above ground at
Badwater, the lowest point in the valley (282 feet below
sea level).
Shoreline Butte has easy-to-see weak shorelines on it called
strandlines that were formed by wave action from Lake Manly. These features were created by different stands of the lake, which would change its depth over time and also cause slight changes in climate. The conditions under which this lake existed are called
pluvial by geologists instead of glacial because glaciers didn't directly touch Death Valley - but the meltwater from the glaciers and the cooler and wetter temperatures of the time did affect the valley. Approximately 8000 feet (about 2500 m) of gravel, sand, and mud overlay the bedrock of the valley floor.
In 2005, large amounts of flooding resulted in Lake Manly's reappearing on a large scale. Over a hundred square miles were covered by the lake, allowing some tourists and park rangers to become probably the only humans to canoe across the valley. The lake was about two feet at its deepest point. As a result, it evaporated quickly, leaving behind a mud-salt mixture.
Lake Manly is named in honor of
William L. Manly, who was among the original Death Valley party in
1849. Manly and a companion walked out of Death Valley to the
Los Angeles area, where he found help and returned to Death Valley to assist the rest of the party out. His autobiography is
Death Valley in '49, which he wrote later in life.
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