OAKLAND -- Work to secure the hillside above the Broadway Terrace onramp to southbound Highway 13 is progressing.

Caltrans has been working to stabilize the hill below the homes on Sheridan Road for the past 18 months, according to RocQuel Johnson, Caltrans District 4 branch chief for public affairs.

"The hill was unstable because of water seepage into the hillside from the homes above the freeway on Sheridan Road," said Johnson, who added that no work was performed on the onramp itself. "The goal was to secure the hillside for the safety of the homes and the freeway below."

Johnson said Caltrans garnered feedback for the project from the affected homeowners before initiating the stabilization project.

"We wanted to be on the same page with homeowners going forward," Johnson said.

To stabilize the hillside, three micro pile retaining walls, which are grounded with anchors, were installed at different elevations on the hill.

"The retaining walls will improve drainage and prevent sliding of the hillside," Johnson said.

Caltrans workers removed some soil from the hill and installed a biodegradable surface to hold landscaping. Planting of the vegetation is scheduled to be complete by 2015.

Two more land stabilization projects -- which will require similar retaining walls -- are planned along northbound Highway 13 between Thornhill Drive and Moraga Avenue, starting in the fall or winter of 2015, according to Johnson.

One area will be the hillside between the freeway and Fernwood Drive; the other will be near the ramp at Moraga Avenue.

Community meetings will be scheduled before the start of work.

The project is scheduled to be completed by 2015, according to Caltrans.