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BACKGROUND: The NWP maintains safe and navigable waterways in Oregon through a variety of dredging projects, including channel deepening, and dredging sandbars. Placement of dredged sediment occurs at preselected, specific geographic areas. One such group of sites are categorized by NWP as nearshore beneficial use sites, these are used for the Mouth of Columbia River Federal Navigation Project (MCR). Approximately 3–5 million cubic yards of sand is dredged annually from the MCR entrance channel to keep the deep-draft federal navigation channel open. Much of the dredged sand is placed at the nearshore beneficial use sites (North Jetty and South Jetty Site, Oregon), this allows natural migration of the dredged sand through the Columbia River littoral cell (Norton et al. 2015). Beneficial use sites are commonly monitored before, during, and after disposal, to evaluate dredge management practices and to avoid potentially adverse effects to the marine environment.

Monitoring a nearshore beneficial use site : application of a benthic sled and video annotation