Sandy River Engineered Log Jams

PORTLAND WATER BUREAU Sandy River Engineered Log Jams Multnomah County Awesome IMAGE not some “before” image Putting the final touches on an engineered log jam. rom its origin as snowmelt from the slopes of Mount Hood, the Sandy River More than 1350 carefully placed logs F flows 56 miles before emptying into the Columbia River. The river and its create and enhance much-needed tributaries support several anadromous species, including threatened salmon and steelhead. Over the last several decades, human impacts have contributed to a habitat for endangered salmon and significant decline in salmon and steelhead runs. Working with the Portland Water steelhead in a major tributary to the Bureau, Metro, and the Oregon Parks and Recreation Department, Biohabitats restored key salmon and steelhead habitat at two sites along the Sandy River: Columbia River. Oxbow Regional Park and Dabney State Recreation Area. SERVICES At Oxbow Regional Park, Biohabitats excavated and reactivated an historic, 2,200- Construction foot long side channel by installing large, engineered log jams designed to push flow into the channel and provide habitat. With the assistance of a heavy lift helicopter, the team also placed large wood in an existing side channel to enhance habitat. A second engineered log jam was installed at Dabney State Recreation Area. Prior to construction, Biohabitats engineered a system to divert the flow from the side channel with a hand-placed weir. The engineered log jam (ELJ) required excavating 20 feet below the river bed. The ELJ pit was dewatered by pumping water to the adjacent upland forest for filtration. More than 1,350 pieces of locally sourced large wood, 1,800 tons of boulders, and 1,500 cubic yards of slash were used to create salmonid habitat for this ecological restoration project. The project was recognized by the American Council of Engineering Companies of Oregon as the winner of the 2019 Engineering Excellence Award for Small Projects. © Biohabitats | Restore the Earth & Inspire Ecological Stewardship.

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Our Tuesday and Thursday Series of Day Hikes and Rambles, Most Within Two Hours of Lake Oswego
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