 Local, county, state, federal and private industry experts in engineering design, fluvial geomorphology and fisheries conservation are working together to protect important public infrastructure such as roads and commercial and residential developments, while maintaining, improving, restoring, or creating aquatic habitat.The sheer mass of the dolosse provides ballast for logs and slash ("wrack" or "rack" organic debris) to create a stable, complex habitat structure, all the while precluding the need for excessive, environmentally-invasive and costly excavation for their placement into substrate.Such ELJs are of a new, innovative design that are on the leading edge of engineering and science technologies in aiding the recovery of Pacific Northwest (particularly Endangered Species Act-listed) salmonids, while protecting important public and private works and thus helping to balance the needs of Man and Nature.