A nearly 18-month closure of Diamond Bar Golf Course will begin Wednesday to allow it to be reconfigured because nearly 10 acres have been taken for planned freeway improvements.

The improvements will fix the area where the Orange (57) and Pomona (60) freeways merge, known as California’s worst truck bottleneck.

The San Gabriel Valley Council of Governments, in cooperation with the Los Angeles County Department of Parks and Recreation and Los Angeles County Metropolitan Transportation Authority, will oversee the renovations to the golf course and facilities. The course is scheduled to reopen in early 2023.

Six holes located along the freeway frontage and Grand Avenue will be reconfigured as part of a redesigned 18-hole layout which maintains the current course par and yardage.

Other enhancements include the installation of new tees, sand traps and the construction of a new maintenance facility and replacement of the irrigation system.

These renovations will allow for freeway mainline improvements and ramp and interchange reconfigurations, as well as the addition of auxiliary collector/distributor and bypass lanes set to begin construction in 2022.

The improvements will enhance freeway operations by significantly reducing traffic weaving, congestion and collisions in the freeway confluence zone, a 2.5-mile stretch where the freeways merge.

Currently, commuters and trucks must navigate and weave across multiple lanes to connect between the two freeways, resulting in the second-worst truck-involved accident location in Southern California.

The frequently clogged and hazardous interchange used by more than 350,000 motorists a day is among the most heavily traveled freight highway corridors in the nation. It is ranked first on the West Coast and 11th in the nation for truck delays.

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