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The Dillon Dam, in Summit County, Colorado, is a large earth-fill dam constructed on a foundation of faulted and extensively jointed Mesozoic sedimentary rocks. Appurtenant features include a diversion tunnel and spillway shaft.

Geologic features determined by preliminary exploratory drilling and by detailed studies during construction permitted close control of foundation excavation and grouting operations. Special problems were created by heavy water flows from pervious gravels up to 80 feet deep that covered bedrock in the valley floor of the Blue River, and by repeated movements of an ancient landslide reactivated during dam construction of loading by a temporary earth embankment and simultaneous excavation near the toe of the slide.

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