Built from 1938 to 1943 and maintained by the U.S. Army Corps of Engineers' Pittsburgh District, the Johnstown Local Flood Protection Project reflected the 1930s move toward a major federal role in local flood protection. This concrete-paved channel project extended 9.2 miles along Johnstown's three rivers and became the nation's second largest flood control project of its type. In its first 50 years, the only flooding here was in 1977, during the modern flood of record.