We just got the word from Caltrans:
If you're going to SFO to pick someone up late this Friday, July 9 or Saturday, July 10, if it's after midnight you'll need to come back to Marin via Van Ness Ave. and Lombard St. or Bay St. in San Francisco. The ramp connecting 19th Ave. and Park Presidio to Doyle Drive and the Golden Gate Bridge will be closed (starting at Lake St., the last cross street before the tunnel) from midnight to 5:00 AM for construction.
Alternate routes to the Golden Gate Bridge from the City, SFO and the Peninsula:
1. Take 101 north instead of 280 and 19th Ave, and follow the signs for the Golden Gate Bridge. They'll route you up Van Ness Ave. to Lombard St. to Doyle Drive, which avoids the closure.
2. Take 280 north to where it ends and follow the Embarcadero up to Bay St. (just before Fisherman's Wharf). Turn left on Bay and follow it all the way through the Marina and to the Golden Gate Bridge.
3. If you're in western San Francisco, take 19th Ave. north to Geary Blvd. Turn right on Geary, take it for about 2 miles over the hill and turn left on either Franklin or Van Ness. Either one will take you to Lombard St. and the Golden Gate Bridge.
If you don't mind steep hills, take Geary east about one mile and turn left at Divisadero. It will take you over a steep ridge and down to Lombard St., where you can turn left to reach the Bridge.
Caltrans has a graphics-rich website with information about the project here.
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