Overview
On September 26, 2006, the Authority’s Board of Commissioners unanimously selected the Presidio Parkway as the Preferred Alternative. The Presidio Parkway will replace the existing Doyle Drive with a new parkway-type roadway that includes short tunnels, new access and improved views from within the Presidio of San Francisco.
Key Design Refinements to the Preferred Alternative
Working with stakeholders and resource agencies, the project team refined the Parkway Alternative to minimize or eliminate potential impacts to the natural environment, cultural resources, the Presidio, and community resources. Key design refinements are:
- Raise the original profile of the southbound lanes to preserve the cultural landscape and retain the cultural relationship between the upper and lower portions of the Presidio.
- Revise the landscaping of the Main Post tunnels to recreate the bluff north of the tunnels.
- Realign the low causeway to create greater separation between the roadways over the future marsh expansion area to increase light penetration and to improve the wildlife corridor. The road curvature introduced by this refinement also calms traffic by reducing traffic speeds before reaching city streets.
- Reconfigure the Girard Road interchange to preserve the Gorgas Avenue streetscape adjacent to the historic warehouses and to improve views to the Palace of Fine Arts.
- Modify the Gorgas Avenue/Richardson Avenue intersection to improve pedestrian connections, provide consolidated transit access and deter cut-through traffic.
- Restore the top portion of Building 201 in the original location to preserve the historic Halleck streetscape and historic bluff.
- Treat roadway pollutant runoff with passive, low impact measures to the maximum extent practicable to improve the water quality
