Erosion Control March/April 2017 : Page 25

either the Aqua Dam or the pilings. It was used in the deep-est area that required excavation. Installing all of the dams took only a day. Removing them required about the same amount of time. With no rain, the deepest part of the Eel River was only 6 feet. The gravel lying atop the riverbed meant no dirt would be disturbed when timbers were removed, so it wasn’t necessary to extend the dams all the way to the far shore. Benzinger, who had seen Aqua Dams used on other proj-ects, says that on this project the dams “worked quite well.” Timing was a big challenge to the project. “We had to get everything done before the water would rise [with the onset of fall rainy weather],” he notes. Fortunately, the weather was “really nice, perfect for working—hot and dry.” The age of the bridge brought its own challenge. “Any time you’re dealing with old structures there are lots of unknowns,” he adds. To remove the old timbers and other debris from the site, an excavator was stationed on an adjoining section of the bridge. Its operator lowered a bucket over the side so workers could put used material inside for convenient collection and later hauling to a dumpster. Wildlife posed no problems during the project, but before work could begin, all fish nearby in the Eel River had to be safely removed and relocated beyond the site. A California Fish and Wildlife biologist was present to supervise this pre-liminary step. Niangua River Several states east of the Eel River lies the Niangua River. A tributary of the Osage River, it flows for 125 miles through cen-tral and southern Missouri. Part of the larger Mississippi River watershed, the Niangua is popular for water recreation includ-ing fishing, kayaking, canoeing, and white-water rafting. An interesting pipeline replacement project took place on the Niangua from July until late November 2016. The work site for the project is about 5 miles east of Buffalo, MO, and 30 miles north of Springfield, MO. The land on both sides of the river is owned by the same farmer, which made the operation a bit easier. The work itself was nowhere near as easy. The crew dealt with installing 900 feet of pipeline (includ-ing 350 feet across the width of the river); blasting through solid rock, and working within 70-foot rise uphill, white-water rapids, and a flood zone. And then there were the cop-perheads to avoid—lots of them. “It was a tough job,” says Ladie Durkin, construction superintendent for Minnesota Limited of Big Lake, MN. He describes the sheer rock hill as having “a slope of 45 degrees or sharper.” Founded in 1966, Minnesota Limited is one of the largest construction firms in the central US. The company special-izes in pipeline installation and replacement and related facility construction in the energy field. The job on the Niangua River involved replacing worn-out pipes carrying crude oil for Enbridge Pipeline of Water Controlling Water Flow Control = Erosion Control t5VSCJEJUZDPOUSPM t'MPXDPOUSPM t3JWFSEJWFSTJPOT t$BOBMQMVHT t4USFBNDSPTTJOHT t0UIFSBQQMJDBUJPOT Levee Erosion Control, Arkansas River, Pueblo, CO Long Cove, Cedar Lake, Texas Call for a quote –1.800.682.9283 or see more at our website, MARCH/APRIL 2017 EROSION CONTROL 25

Aqua Dam Inc.

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