For the second time in four months a 240-ton leaf of a main Ohio River miter-gate lock has failed, severely restricting shipping and signaling, once again, that it can be perilous to depend on aging infrastructure. Photo: USACE Photo: USACE Snapped Miter anchor arm may have fallen to fatigue. X-rays of the other arms at the lock show no cracks. On Jan. 27, as the main-chamber, downstream gate of the Greenup Lock and Dam, near Greenup, Ky., neared closure, operators heard a pop and the landside leaf canted over, but it did not fall. Mike Keathley, the U.S. Army Corps
The market is generally healthy and steadily growing, and margins are up for large specialty contractors. Further, advances in design tools and owner demand for collaboration are giving subcontractors a seat at the table early on in projects.