How deep was the mud and debris from the landslide?

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The Landslide Left Mud and Debris Up to 15 Feet Deep

The landslide in Washington state, which occurred near Oso, approximately 55 miles (90 km) northeast of Seattle, resulted in mud and debris accumulating to a depth of up to 15 feet (5 meters). This massive slide, covering a square mile (2.6 square km) of land, occurred on Saturday morning after rain-soaked embankments along State Route 530 gave way. The accumulation buried at least six homes and vehicles, leading to a confirmed death toll and a significant number of missing individuals.
Significant Loss of Life and Property

As of yesterday, authorities confirmed eight fatalities and reported 18 individuals missing following the catastrophic event. The landslide's immense force washed out at least six homes and inundated others, along with numerous vehicles, under the thick layer of mud and debris. In addition to the deceased and missing, eight people sustained injuries.
Challenging Rescue Operations

Rescue efforts were severely hampered by the treacherous conditions on the ground. The mud and debris created quicksand-like environments, with some rescuers becoming stuck up to their armpits, requiring assistance to be freed. These dangerous conditions led to the temporary halt of search operations at dusk, with plans to resume at dawn.
Impact on Infrastructure and Environment

The landslide occurred in the foothills of the Cascade Mountains alongside the Stillaguamish River. The sheer volume of displaced material blocked the river's flow, causing flooding and a water backup behind a natural dam formed by the mud and debris. Consequently, State Route 530 was closed in both directions, with no immediate timeline for its reopening. A state of emergency was declared in Snohomish County in response to the disaster.

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How deep was the mud and debris from the landslide?

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