Ferguson Rock Shed Project
Ferguson Slide Rock Shed Construction (10-0P921), Mariposa Talus Removal (10-0P922) and Ferguson Slide Talus Removal (10-0P923)
The California Department of Transportation (Caltrans), as assigned by the Federal Highway Administration, plans to restore the section of State Route 140 damaged by the Ferguson rockslide by constructing a protective shed.
The project construction has been split in two distinct construction projects. Phase 1 will remove the existing talus material and install cable net drapery to minimize additional rock fall. Phase 2 will be construction of a 675-foot rock shed structure on the same alignment.
The purpose of this project is to restore full access to SR-140 providing a reliable route within the limits of the Ferguson Slide area and to keep SR-140 open to vehicular and bicycle traffic, including large commercial trucks, emergency vehicles, and recreational vehicles.
The project is needed because access to Yosemite National Park and the community of El Portal has been severely restricted resulting in significant economic losses.
Currently, motorists use a temporary bypass route to travel this portion of SR-140. Restoration of SR-140 would eliminate inconvenient detours and extended commute times for residents, businesses, and workers in the area. Restoration of the route would also give travelers a direct route to Yosemite National Park and other destinations along SR-140.
Phase 1, Talus removal:
- Contract approval – February 2021
- Begin construction – March 2021
- Trim blasting operations – April-May 2021
- Construction duration – 180 working days
- Contract awarded for $22.7M to Meyers & Sons/RL Wadsworth
- Use of real-time slide monitoring equipment
- Use of remote-controlled equipment
- Comprehensive safety plan on determining how to work within in the slide zone relative to current slide conditions
- Removing 147,000 tons of material
Phase 2, Rock Shed:
- Begin construction – Fall 2022
- Construction duration – 5 years
- Estimate construction cost -- $175M (December 2019)
Rock Shed Details:
- First rock shed to be constructed by jacking pre-cast concrete segments around a curve
- Consists of 11 pre-cast concrete segments
- Length is approximately 675 feet
- Interior width is 40 feet
- Restraining base is anchored by 200 rock anchors and 400 concrete micro piles.
Bob Highfill, Public Information Officer
Phone: (209) 986-9428