Mercer Island posts landslide information as storm season starts

With sustained rains expected to continue, landslides on Mercer Island will become more likely.

  • Friday, November 24, 2017 7:30am
  • News
Islanders see between six and 15 landslides a year. Photo courtesy of the city of Mercer Island

Islanders see between six and 15 landslides a year. Photo courtesy of the city of Mercer Island

With sustained rains expected to continue, landslides on Mercer Island will become more likely.

In a typical year, the city will see between six and 15 landslides. The resulting damage can cost from a few thousand dollars (for smaller slides), to upwards of several hundred thousand dollars, not to mention personal injury.

Slides are typically triggered by excess water and most include a contributing human factor such as people discharging their roof drains onto slopes, removing vegetation from slopes or excavating into or placing fill onto slopes. Broken pipes underground can also be a problem.

Understanding and avoiding common contributory causes can effectively reduce landslide risk.

Learn about previous incidents, view known hazard areas, read city factsheets and more at www.mercergov.org/Landslides.

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