Using GIS statistical analysis, this survey also estimated that the lake contains around 0.5 cubic miles (2.1 km3) of fresh water.

Anadromous fish such as steelhead and coastal cutthroat trout migrated into the valley from lower waters.

Approximately 8,000 years ago, a great landslide from one of the Olympic Mountains dammed Indian Creek, and the deep valley filled with water.

However, when power cable was being laid in the lake in the 1980s, instruments showed depths over 1,000 feet (300 m), the maximum range of the equipment used.

During the Lake Crescent Bathymetric Survey, it was speculated that the erroneous depth record of 1,000 feet (300 m) from the 1980s was a result of the sonar signal reflecting off the steep underwater slopes near the shore.

1,100 BCE event, an earthquake triggered the 7,200,000-cubic-metre (9,400,000 cu yd) Sledgehammer Point Rockslide, which fell from Mount Storm King and entered waters at least 140 metres (459 ft) deep, generating a megatsunami with an estimated maximum run-up height of 82 to 104 metres (269 to 341 ft).

Their whereabouts remained unknown until 2002 when their 1927 Chevrolet automobile was found over 160 feet (49 m) beneath the surface of Lake Crescent.

Her skin had turned into a substance described as "ivory soap," which was caused by minerals in the lake water interacting with body fat in a process called saponification.

[9] Media related to Lake Crescent (Olympic National Park, Washington) at Wikimedia Commons