The Columbia Bar is a bar at the mouth of the Columbia River where the current dissipates into the Pacific Ocean, often as large, standing waves partially caused by the deposition of sediment as the river slows.
The Columbia Bar is a bar at the mouth of the Columbia River between the U.S. states of Oregon and Washington. The river's current often dissipates into the Pacific Ocean as large, standing waves, partially caused by the deposition of sediment as the river slows.