Ferguson Slide Rockshed CMGC
March 18, 2015
Located on State Route 140 in Mariposa County, this project spans from 8 miles east of Briceburg—a small community anchored by a Bureau of Land Management Visitor Center—to 7.6 miles west of El Portal (post miles 42.0 to 42.7). This stretch of highway was severely impacted by the Ferguson rockslide in April 2006, which buried the roadway under approximately 798,000 tons of rock and debris.
Prior to the slide, this section of SR-140 was a two-lane, undivided highway. The Ferguson Rock Slide Project marks a significant milestone as the first Construction Manager/General Contractor (CM/GC) project in the State of California to begin construction, and only the second rock shed ever built in the state.
The CM/GC delivery method is an innovative, collaborative approach that integrates planning, design, and construction. It brings together a diverse team of stakeholders to manage the project efficiently and effectively from start to finish.
Key project details include:
- CM phase duration: approximately 450 working days
- GC phase duration: approximately 600 working days
- Total project cost: $110 million
- Required construction pace: $3.125 million per month over 32 months to meet schedule requirements
In accordance with California State Assembly Bill 1973, construction was mandated to begin no later than January 2016 due to environmental regulations. The project’s success hinges on precise coordination, environmental stewardship, and innovative engineering solutions to restore this vital transportation corridor.
