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Imposing columns and pillars of ice were visible everywhere—massive icicles and mounds, built up from the spraying water tapped from the piping that paralleled the penstock.
Do not anchor to any manmade structures including the penstock system large metal pipe.
They came up to a steel trestle that held the ancient penstock above an open gorge.
With exaggerated care Cynthia mounted the wooden catwalk atop the penstock, holding Dean's hand tightly.
After a few minutes rest, they continued, first hearing, then seeing the waterfall and the reservoir from which the penstock first drew the water for its mile-long trip to town.