A casual stroll along the riverwalk near Chicago's Magnificent Mile was becoming dangerous. The threat was from limestone panels that were falling from a retaining wall bordering the walkway. The 12-foot-high concrete retaining wall extends about 1,000 feet along the Chicago River. The exposed face of the wall is covered by 3-inch-thick limestone panels. Between the limestone panels and the exterior face of the concrete wall is a 4-inch-thick concrete block wall. OBSERVED DISTRESS Crumbling mortar joints between coping stones at the top of the wall had dislodged many stones, creating gaps between them. This had allowed water to enter the wall cavities, causing extensive corrosion of the mild-steel anchor assemblies and freeze-thaw damage to some of the concrete block. REPAIR OPTIONS The existing limestone panel anchors had lost most of their capacity and could not be relied upon to keep the panels secure. Repairs were needed to secure new or existing limestone panels to the block wall and to reattach the block wall to the concrete retaining wall. The adopted repair scheme was to install supplemental stainless steel anchors to attach both the limestone panels and the concrete block wall to the retaining wall behind them. This was achieved by using epoxy-filled stainless steel screens around the new anchors. This repair solution reduced costs because it did not require the existing limestone panels to be replaced nor the existing block wall to be rebuilt.