The Columbia River estuary is roughly 150 miles long, bordered by Washington to the north and Oregon to the south. This unique ecosystem contains diverse freshwater and saltwater wetlands, shaped over centuries by riverine and tidal forces. This area is critical habitat for many salmon, steelhead and other aquatic species in the Columbia Basin. All Columbia Basin salmon must migrate through the estuary on their way to the ocean, feeding and growing along the way. Some species, including Chum and Chinook salmon, rear for an extended period in the estuary. Wetland and open water habitats in the estuary have been dramatically impacted over the last two centuries by shoreline development and hydroregulation by dams. Inter-Fluve has been working to reconnect historically disconnected floodplains to increase quality habitat and support estuarine ecosystem function.