Blue Mesa Construction Forms
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Blue Mesa Construction Forms. "The dam stands in an area where sandstone and shale overlay pre-Cambrian granite, schist and gneiss. It is situated at a narrows in the river valley where the Gunnison enters the upper reaches of the Black Canyon of the Gunnison. The dam has a volume of 3,080,000 cubic yards (2,350,000 m3) and the spillway intake structure has two radial gates. These discharge into a concrete-lined tunnel which in turn discharges through a flip bucket into a stilling basin."