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Road Closure for San Marcos Road Repair and Stabilization Project

26 October 2023
Category: Project

Starting Monday, October 30th, San Marcos Road will be closed for construction at the San Marcos Road Repair and Stabilization Project site (see map).  This important project will construct a soldier pile retaining wall to stabilize the section of roadway located ¼ miles south of Los Altos Road that failed during the January 2023 storms.

This road closure is not expected to have a significant impact on residents since there are other alternate routes to properties on both sides of the project site. There will be traffic signage to notify drivers of the closure at locations that will allow for taking alternate routes. The project is expected to take approximately two months to complete.

During the January 2023 storms, heavy rains and saturation of the road subgrade led to a landslide adjacent to 11285 San Marcos Road. This resulted in the loss of approximately 40 linear feet of the west (southbound) lane of the roadway, and settlement and destabilization of an additional 145 linear feet of the southbound lane. The road has been narrowed to a single lane at this location with traffic barricades and two-way stop control since the damage occurred. 

This project includes the construction of a 190-foot long soldier pile retaining wall along the western (downhill) edge of San Marcos Road and associated earthwork, installation of metal beam guardrail, and reconstruction of the roadway. The Atascadero City Council awarded this project to Souza Construction at their August 30, 2023 regular meeting.

For any inquiries or additional information regarding this work, please contact Public Works at 805-470-3456 or