The Big Four Ice Caves have a history of collapses, accidents and rescues.
Sept. 12, 1990: An 18-year-old Woodinville man is rescued by helicopter after climbing to about 100 feet above the Big Four Ice Caves snowfield.
Jan. 4, 1992: An avalanche traps three hikers and carries a pregnant woman about 300 feet away from the caves. The hikers use a pocket knife to tunnel their way through 30 feet of snow after the avalanche blocked a narrow entrance to the caves. The pregnant woman suffered minor injuries; the baby was fine.
Oct. 29, 1995: A 28-year-old woman is cut on her head after a portion of the caves collapses. The woman’s husband said he heard a noise and turned around to find his wife covered in about 6 feet of snow and ice.
July 25, 1996: During a YMCA trip, two boys, ages 10 and 12, suffer minor injuries after being hit by ice.
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July 2, 1997: A 32-year-old woman is airlifted from the caves after she falls, possibly fracturing her ankle.
Aug. 2, 1998: Catherine Stockton Shields is killed by collapsing ice at the caves. Shields, 27, of Bothell, was with her husband and his parents when an ice arch at one of the caves’ main entrances collapsed.
Nov. 6, 2006: A storm destroys the bridge on the trail leading to the caves.
Sept. 4, 2007: Two men, ages 37 and 19, are rescued from a cliff after becoming trapped on a ledge near the cave.
June 27, 2009: A new aluminum bridge opens on Ice Caves Trail.
July 31, 2010:Grace Tam, 11, of Lake Stevens, is killed by a boulder of ice on the ice field outside the caves.
May 13, 2015: Snohomish County officials warn visitors after sections of the caves collapse in warm weather. A ranger said at the time that “the cave is in its most dangerous state,” with conditions not normally seen until September.