The Columbia Bar, also frequently called the Graveyard of the Pacific, is a system of bars and shoals at the mouth of the Columbia River spanning the U.S. states of Oregon and Washington. It is known as one of the most dangerous bar crossings in the world. The bar is about wide and long. Description The bar is where the river's current dissipates into the Pacific Ocean, often as large standing waves. The waves are partially caused by the deposition of sediment as the river slows, as well as mixing with ocean waves. The waves, wind, and current are hazardous for vessels of all sizes. The Columbia current varies from westward, and therefore into the predominantly westerly winds and ocean swells, creating significant surface conditions. Unlike other major rivers, the current is focused "like a fire hose" without the benefit of a river delta. Conditions can change from calm to life-threatening in as little as five minutes due to changes of direction of wind and ocean swell. Since 1792, approximately 2,000 large ships have sunk in and around the Columbia Bar, and because of the danger and the numerous shipwrecks the mouth of the Columbia River acquired a reputation worldwide as the graveyard of the Pacific. The navigational channel is wide at the west end and narrows to within the jetties (though the jetties themselves are never closer than apart). The channel is dredged to in the northern three-quarters and for the southern quarter. Inside the bar, the channel remains wide and reduces to deep. The Clatsop Spit juts into the ocean on the south side of the river mouth, and on the north side is Peacock Spit, named after the USS Peacock which wrecked there in 1841. In 1884, after decades of shipwrecks, the United States Corps of Engineers built the south jetty to keep the channel navigable. In 1914, the north jetty was added. The nearby United States Coast Guard Station Cape Disappointment, Washington, is renowned for operating in some of the roughest sea conditions in the world, and is home to the National Motor Lifeboat School. It is the only school for rough weather and surf rescue operation in the US, and is respected internationally as a center of excellence for heavy boat operations. Approximately 16 bar pilots, earning about $180,000 per year, guide ships across the bar, often boarding ships by helicopter. They generally consider "the