The southbound Highway 101 on-ramp at Los Osos Valley Road will be closed for four days starting Sunday night as work continues on a major project at the interchange.
The $33 million project — one of the city’s largest public works projects in 30 years — will widen Los Osos Valley Road to four lanes from Calle Joaquin to South Higuera Street.
The ramp closure starts at 9 p.m. and runs until Aug. 28 at 6 a.m., weather permitting, according to a news release from Caltrans and the city of San Luis Obispo.
The closure will allow the contractor on the project to raise the elevation of the existing southbound on-ramp about five feet.
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Motorists heading south can detour by traveling eastbound on Los Osos Valley Road to South Higuera Street to get to Highway 101, or use the ramps at the Madonna Road interchange.
After the ramp reopens Aug. 28, officials expect that both westbound and eastbound traffic on Los Osos Valley Road will start using the new bridge that was constructed as part of the project. It will eventually carry only eastbound traffic over the highway.
The ramp, after it reopens, will only be accessible from eastbound Los Osos Valley Road.