Gold was discovered in the area that became Columbia on March 27, 1850, by John Walker, who was a member of Thadeus and George Hildreth's party. This discovery was one of the richest finds of the California Gold Rush. The surface-level deposits were amenable to
placer mining, but lacked water needed for such operations. Over the next several years, a network of water supply
aqueducts was built (at a cost of over $1 million) to the area to support mining operations. By 1852, sufficient water was arriving to support the development of a mining boom town, and large-scale mining operations began in 1856. The ditch was officially completed in 1858. The town was incorporated in 1854, and its population fluctuated in the 1850s between 2,000 and 5,000 people. The town was repeatedly struck by fire, and much of the construction after an 1857 fire was in brick. ==Media exposure==