Project managers tasked with installing 44 miles of fiberoptic cable to enhance Internet infrastructure in Nevada County have completed about 18 miles of the project, officials said Thursday. The Central Valley Next-Generation Broadband Infrastructure Project, which includes Nevada County and 17 other counties spanning south from Colusa to Bakersfield and Nevada City to Mariposa, began installing miles of fiberoptic cable throughout Nevada County about two months ago. The project, which is being administered by Minnesota-based MPnexlevel, is scheduled to be completed in late June or early July, said Jim Warren of Vali Cooper & Associates, a Sacramento-based construction consultant company. …