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Fisher Associates staff performed a 3D topographic and utility survey of the existing Red House Lake Dam spillway, overtopping bridge and highway, and adjacent earth embankment. A bathymetric survey and mapping of Red House Lake were also performed to depict the underwater reservoir contours. Staff performed 100% hands-on inspection of the bridge superstructure and substructures above the water upstream and downstream of the dam crest, the submerged concrete apron, and the concrete spillway and dam face downstream of the dam crest. Work included hammer sounding and visual inspection, concrete cores, underwater inspection via dive team, and reporting. Lastly, our surveyors performed a 3D survey and mapping of concrete test markings on the arch undersides.
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