Tue June 01, 2021 - West Edition #12 Irwin Rapoport â CEG Correspondent Crews from Q&D Construction recently completed the Echo Summit bridge replacement three months ahead of schedule thanks to an accelerated bridge construction (ABC) method. Employing an accelerated bridge construction method (ABC), Q&D Construction was able to complete the California Department of Transportation's $14.1 million U.S. Highway 50 Echo Summit Sidehill Viaduct Replacement Project three months ahead of schedule. The original bridge (two lanes, 129-ft. long and two spans), constructed in 1939 for $25,000 in El Dorado County, served motorists for more than 80 years as the primary route between Sacramento, Calif., and South Lake Tahoe. The new structure, two lanes and 96-ft. long single span, meets current safety and seismic standards.