The Telegraph Hill Rock Slope safety improvement project is stabilizing the crumbling cliff below Coit Tower, and on the hillside at Chestnut Street. The next phase of work began in April 2016 along the rock slope at Chestnut Street. San Francisco Public Works hired Drill Tech Drilling & Shoring, Inc. to perform the work.
 

The Telegraph Hill rock slope faces east and is located at Kearny between Lombard and Chestnut, and it has a long history of failures and rock slides over the years. A major rockslide occurred in January 2012, where chunks of rock the size of mini vans slid down the hill. More recently, another slide occurred at Chestnut in December 2014.
 

The project will secure the hillside and reduce the potential for future rock slides in the historic neighborhood and popular lookout spot.
 

Work on Phase One of the project lasted from November 2014 to June 2015 and secured about half of the hillside with more than 400 rock anchors. Public Works hired Geo Stabilization International to perform the work: excavating and hauling out several tons of loose rock from the cliff, drilling hundreds of holes, some 30 feet deep, installing sturdy rock anchors and covering the vulnerable rocky areas with a hefty wire mesh.

Phase One Project Description (archive)

San Francisco Public Works hired Geo Stabilization International to perform work along the Telegraph Hill rock slope on the east side of the cliff at Lombard Street, below Coit Tower. The work included rock/slope repair, rock excavation and haul, and slope stabilization.
 

This critical safety work lasted from November 2014 to June 2015.