The site is owned by Puget Sound Energy, Avista and Williams Companies's Northwest Pipeline GP.
[1][2] With 25 billion cubic feet working capacity (47 billion cubic feet total capacity), it is the largest natural gas-storage reservoir in the Pacific Northwest and the 14th largest in the United States.
[3][4] Located in the community of Mary's Corner, Washington,[5] the gas storage is in an aquifer contained by the sandstone Skookumchuck formation, about 1,000 to 3,000 feet underground.
[8]: Slide 2 Gas began escaping in early 1965 after the drilling of a new bore hole, requiring the installation of specialized fittings to shut off the leak.
Despite a minor evacuation, a no fire order, and law enforcement patrols, no explosion or injuries occurred.