The swelling cost can be blamed on design changes that have been made over the last 16 months and damage to the facility near Oroville, Calif., that was far more extensive than initially presumed, the department said.
The Department of Water Resources designed the repairs and issued a contract to Kiewit Corp. in April 2017 based on an estimate that the company could perform the work for $275 million. But the cost of that portion of the project has shot up to $630 million. In addition, the department’s internal costs have grown by $100 million, reaching $310 million. The agency also paid $160 million in emergency response costs, including removing sediment and installing temporary power lines.
In total, the cost of getting the spillway repaired and upgraded has gone up by about $1 million every day since April 2017. …