The family of a 15-year-old Ballard High School student who fell to his death at Gas Works Park has filed a nuisance lawsuit against Seattle, seeking to force the city to address the dangers posed by the park’s looming tanks and structures.

The lawsuit, filed by the family of Mattheis Johnson, notes his was the third death resulting from falls off the rust-covered complex of old tanks, pipes, ladders and cracking towers at the park since 2012. Dozens of less-serious fall injuries have been reported since the city opened the park in 1970 on the site of a coal gasification plant, operated by Seattle Gas Light Co., which ceased operations in 1956.

The park is a Seattle landmark and the site of concerts and gatherings, including the annual Lake Union Fourth of July fireworks display.

The la

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