The 20th century saw Columbia emerge as a regional textile manufacturing center. In the 1920s, Columbia businessmen constructed a large dam on the Saluda River to make hydroelectric power. The dam, using the native red clay soil and bedrock, was the largest earthen dam in the world when it was completed in 1930. Lake Murray which was formed by the dam is 41 miles (66 km) long, and 14 miles (23 km) wide at its widest point. At the time when the lake was finished, it was the world's largest man-made reservoir. The company that built the dam grew to become SCANA Corporation, one of Columbia's largest employers.