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County staff seeks direction on Mount St. Helens Spirit Lake tunnel alternatives; draft EIS comment window opens
Summary
Public works staff asked commissioners whether and how much the county should engage in commenting on the Forest Service draft EIS for Spirit Lake outflow, which lists two primary alternatives: restore the existing tunnel to roughly 550 CFS or install a pressurized pipe plus a natural overflow channel.
Public works staff asked commissioners how much county involvement and advocacy they want regarding the U.S. Forest Service draft Environmental Impact Statement (EIS) for Spirit Lake outflow options related to Mount St. Helens.
Staff summarized the Forest Service's two top alternatives: (1) repair and restore the existing tunnel to a capacity of about 550 cubic feet per second (CFS); or (2) install a pressurized steel pipe, perform minor tunnel rehabilitation and construct a natural overflow channel that would reconnect the North Fork (Toodle) to Spirit Lake while using the new…
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