One hundred percent of tree material removed during the preconstruction activity was recycled or salvaged by Green Waste Recycle Yard in Richmond, California.
More than 50 native plant species, for a total of 45,000 plants, were collected in the Presidio prior to constriction and are now being grown in the Presidio Nursery.
Many of the piles for the high viaduct will be 12 feet in diameter, requiring a special oscillator rig for installation of the piles. Larger, deeper piles mean fewer piles are necessary, opening views from the Presidio to the bay.
The new parkway will allow pedestrians and bicyclists to cross over or under Doyle Drive in accordance with the Presidio Trails and Bikeways Master Plan.
The new parkway will have larger 11- and 12-foot lanes to accommodate buses and provide an improved experience for drivers.
Each weekday, nearly 120,000 vehicles travel between Marin and San Francisco over the Golden Gate Bridge along Doyle Drive.
The start of construction of the Presidio Parkway was accelerated by more than a year thanks to the receipt of $50 million in federal stimulus funding.
The new parkway will improve traffic safety by including continuous shoulders for emergency and disabled vehicles.
The first set of tunnels, the Battery Tunnels, will be constructed north of the San Francisco National Cemetery and span 853 feet.
Halleck Street will be closed and temporarily removed during construction. Upon completion of the Main Post Tunnels, Halleck Street will be restored over the top of the new tunnels.
The Main Post Tunnels will be constructed north of the Main Post parade grounds. These will be the longer of the two sets of tunnels, spanning 1,017 feet.
$3.6 million went directly to small and local businesses for the project’s first preconstruction contract (tree removal and native plant and seed collection).
The new parkway will include extended bus bays on both sides of Richardson Avenue.
Seismic safety will be achieved in 2011 when traffic is transferred onto new structures and the temporary bypass adjacent to the existing facility.
A robust Disadvantaged and Small Business Enterprise Participation Program has been established to actively engage businesses throughout San Francisco, the Bay Area, and California to participate in the project.
The northbound and southbound roadways will be separated by a wide, landscaped median improving driver safety and creating a parkway feel.
Both sets of tunnels will be constructed using the cut and cover method by digging into the natural bluffs and covering the tunnels with a green pedestrian corridor.
Including a temporary bypass in the construction phasing reduced the construction duration by nearly two years.

Long-Term Ramp Closures

Two local ramps connecting Doyle Drive to Park Presidio/Highway 1 will be closed during the timeframes listed below.

The ramp from Northbound Doyle Drive to Southbound Park Presidio/Hwy 1 is now closed through 2013.
The ramp from Northbound Park Presidio/Hwy 1 to Southbound Doyle Drive is now closed through 2011.

View a printable advisory for the long-term ramp closures and their associated detours. (2.0 MB)

Route	Timeframe
1. Northbound Doyle Drive to Southbound Park Presidio/Hwy 1	January 10, 2010 - 2013
2. Northbound Park Presidio to Southbound Doyle Drive	February 17, 2010 - Early 2011

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Enlarged View

These ramp closures do not affect regional traffic coming from or going to the Golden Gate Bridge. The ramps serve a low volume of traffic and are primarily used by San Francisco residents traveling between the Richmond/Sunset neighborhoods and the Marina/Cow Hollow neighborhoods. The vehicles who typically use these ramps will be dispersed throughout the city street network. Traffic between Marin County, San Francisco and San Mateo County will continue to move unimpeded.

Route Scenarios

Marin to San Francisco International Airport

There will be no impact to traffic coming from or going to the Golden Gate Bridge. Traffic from Marin to Park Presidio/Highway 1 and to the San Francisco International Airport will continue to move unimpeded.

Marin to Downtown San Francisco

There will be no impact to traffic coming from or going to the Golden Gate Bridge to downtown San Francisco. Traffic from Marin to southbound Doyle Drive will continue to move unimpeded.

Marina to Richmond

The ramp that connects Northbound Doyle Drive to Southbound Park Presidio/Hwy 1 will be closed until 2013. Motorists that use this route are advised to select an alternate route within the city street network.

For drivers unfamiliar with the area, an official detour will be marked with signage and will direct drivers to Geary Boulevard/Van Ness Avenue/Lombard Street. Drivers who miss the signed detour and arrive at the closed ramp will be directed to use the "last chance detour" from northbound Doyle Drive to the Merchant Road off-ramp to Lincoln Boulevard, to the Merchant Road on-ramp to southbound Doyle Drive.

Richmond to Marina

The ramp that connects northbound Park Presidio/Hwy 1 to southbound Doyle Drive will be closed until 2011. Motorists that use this route can either select an alternate route within the city street network or use the "last chance detour"; this will entail proceeding northbound on Doyle Drive to the signed detour via the Merchant Road off-ramp to Lincoln Boulevard, to the Merchant Road on-ramp to southbound Doyle Drive.