Eighteen months after the dramatic failure of the spillways at Oroville Dam in Northern California, a disaster that led to the evacuation of 188,000 people, construction is on schedule to complete the concrete work in the main spillway by Nov. 1.

In recent weeks, 805 workers from Kiewit, the Nebraska-based company that was awarded the main construction contract on the project, have continued to rebuild sections of the massive 3,000-foot-long spillway.