Since 1936, Doyle Drive had been the main thoroughfare that carried traffic from both U.S. Route 101 and State 1 highways through San Francisco. Traveling north, both highways converge on this strip of roadway and cross Golden Gate Bridge before splitting once again and continuing northward through Northern California. With bridge portions found to be seismically vulnerable, a major reconstruction project was started in 2009 to rebuild the drive. Since then, antiquated and seismically weak bridge sections were sent to the demolition heap and replaced with a new modern southbound high viaduct. In addition, tunnel construction will send two highway segments under shallow ground and extend Presidio Park space. The overall vision to reclaim lost natural land, enhance the beauty of the park and visually connect the Golden Gate Bridge with the new highway is coming to fruition.
From the Palace of Fine Arts to the Golden Gate Bridge, we recently toured this 1.6 mile stretch of roadway to gauge construction progress. Below is a progress summary of the most noteworthy sections.
Finished Project Map
The map above illustrates major construction activity areas inside the parkway limits. Route 1 interchange is to the west of the high viaduct and not seen in the picture. The highway is contained within Presidio Park.
Starting From The Palace of Fine Arts – Low Viaduct
Micropile drilling machinery and other equipment currently sit at the site of the new highway’s low viaduct section. This equipment is being used to create foundation pillars that will support the low overpass.
Main Post Tunnel
Both south and northbound tunnels are under construction with the partially formed southbound tunnel showing more progress. Once the tunnels are complete, earth will be back-filled over the tunnels creating a large grassy expanse of land.
At Grade Roadway Between Tunnels
Heading towards Golden Gate Bridge, the highway currently extends around the unfinished Main Post Tunnel with both lanes converging into the finished southbound Battery Tunnel. A concrete retaining wall complete with guard rails and International Orange colored street lamps, has been built on the south side of the ground level roadway.
The larger southbound tunnel is complete and temporarily funnels two-way traffic while the smaller northbound tunnel is still being built. Work is ongoing as ground and floor level re-bar are currently being installed.
Nearing the Golden Gate Bridge – High Viaduct and Interchange
When completed, the high viaduct section will link Golden Gate Bridge with Battery tunnel and include a highway interchange where travelers from State 1 Highway can either head north or south on the parkway. Walking below the southbound viaduct, an array of iron overhang brackets can be seen colored in the same International Orange as the universally recognized Golden Gate Bridge. False work is being erected for the northbound overpass while an on-ramp segment below the parkway sits on its foundations.