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Upper Columbia Shoot Flume

Upper Columbia Shoot Flume

A 250-foot stretch of the Upper Columbia Ditch is piped with an above-ground 12-inch diameter steel pipe.  This pipe transitions the flow of the ditch through a 50-foot drop in elevation.  Several of the stacked rock piers that support this pipe have deteriorated over time and the pipe is in danger of sliding off the piers. Because it is fully exposed, the pipe is vulnerable to temperature changes over the seasons which can cause it to expand and contract.   Additionally, the pipe is undersized and needs to be a larger diameter. The current state of this pipe jeopardizes TUD’s water supply reliability.

The Upper Columbia Shoot Flume Project will install a new 24-inch diameter steel pipe large enough to carry the full original design capacity of the ditch.  New support piers will be installed which will address the deterioration of the existing piers as well as accommodate the expansion and contraction of the above ground pipe.

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