Saylorville Dam is located on the Des Moines River and provides flood control, water supply, recreation, and wildlife habitat to the area.
polk county, iowa
Saylorville Dam is located on the Des Moines River and provides flood control, water supply, recreation, and wildlife habitat to the area.
THE CHALLENGE
The Saylorville/ Big Creek Dam remediation project required construction of a new Outlet Control Structure that controls the outflow of water from Big Creek Lake and is one of several flood-control structures that protects Polk City from flooding. Construction of a cofferdam on the Lake side of a dam required an excavation subgrade of 63 ft. below normal pool of the lake for the repair and replacement of the existing outlet structure.
THE SOLUTION
Griffin designed and furnished all equipment for the installation of an eductor dewatering system to replace the lake’s long-damaged gate system. The system was installed inside the ±116 ft. x 36 ft. wide cofferdam, to aid in repairing the damaged outlet works.
Griffin installed 28 eductors to a depth of up to 100 ft. and drilled the eductor wells utilizing a floating plant on the outside of the cofferdam. A crane moved the drill rig throughout the site on top of special bracing installed across the top of the cofferdam.
OWNER
US Army Corps of Engineers, Rock Island District
GC
Jensen Construction
TIME
2015-2017
REVENUE
$1,060,393
GRIFFIN DIFFERENCE
The eductor dewatering system controlled groundwater and allowed construction to be conducted in a safe and efficient manner. Griffin worked seamlessly with all necessary parties and complied with all dam safety requirements to complete this job.
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