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Engineered Log Jams on the South Fork Nooksack River Engineered log jams (ELJ’s) mimic natural log jams that chinook use for moving up the river and holding before they spawn Juvenile salmon also strongly prefer to hide from predators in wood cover Log jam‐formed pools tend to be deeper and have better cover from predators and harassment than pools formed by bedrock or rock bank protection
ENGINEERED LOG JAMS It’s an example of the removal of large wood for navigational purposes in America WHAT IS AN ENGINEERED LOG JAM? Structure is rootwads stabilized by cross-logs and bolted in place Aggregate at downstream end for additional stability ability for vegetation to be established
Engineered Log Jams: Recent Developments in Their Design and Placement . . . The ELJs were built as a series of discrete structures spaced along the edge of the highways road fill and acted to deflect flow away from the highway The ELJs were constructed of a log crib design and backfilled with alluvium, topped with soil and planted with native trees (Abbe et al , 1997)
Beckler River Engineered Log Jams (ELJs) Restoration WFC engineers and ecologists developed restoration treatment designs including Engineered Log Jams (ELJs) to capture and retain sediment in the mainstem of the Beckler river channel, which when implemented, will improve aquatic habitat diversity and reconnect the channel to its historic floodplain
FHWAs Innovation Exchange Webinar: Engineered Log Jams June 20, 2024 An emerging approach called “engineered log jams” (ELJs), which uses precast concrete dolosse (i e , pre-cast concrete blocks in a complex geometric shape), is being implemented in the Upper Hoh River Road bank-stabilization project in Olympic National Park, Washington