The Sinus Passage; this passage shows profound variations in water temperature; during the summer months, the water feels like bathwater compared to the 46F temperature of the mainstream. Photo: S. Dankof	The 6 meter stalactite, mainstream passage. Photo: S. Dankof

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Sue's Right Hand Side Passage Photo: S. Dankof	One of many downstream formations occurring on the eastern 'updip' side of the mainstream passage. Photo: S. Dankof

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Another 'updip' formation in the mainstream passage. Photo: J. Bushman	Big Bertha; a massive white flowstone formation familiar to anyone who has ever visited Coldwater Cave. Photo: J. Lovaas

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Another view of Big Bertha by Scott Dankof. Photo: S. Dankof	The Flatland entrance, drilled by the State of Iowa during their study of the cave. Photo: S. Dankof

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In the Cascade Passage; one crosses dozens of flowstone dams while traversing this passage. Photo: S. Dankof	Some fine formations in a large mainstream breakdown room, downstream of the Cascade Passage.Photo: J. Bushman

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Little glory is to be found in the miles of side passages in Coldwater. Nevertheless, they must be mapped and studied. photo by Scott Dankof	Agricultural runoff during spring snowmelt and rain events can generate huge 'agrifoam' piles, some more than 10' high and 100' long. Photo: J. Lovaas

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This wellpipe intersects a side passage of Coldwater Cave. Photo by S. Dankof	While some cavers minimize contact with the 46F water, some relish the idea. Photo: J. Bushman

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