F Market Streetcar Service will terminate at 11th Street and be replaced by shuttle bus to complete the journey to Castro Street between 7am and 7pm today and tomorrow (July 9th and 10th). The temporary change will allow for some tree trimming maintenance in Upper Market.

From the SFMTA web site …

Lines: F
Area: Upper Market
Dates: Wednesday and Thursday, July 9 & 10, 2008
Times: 7:00am until 7:00pm each day
Due to tree trimming on upper Market, the F will run only between Fisherman’s Wharf and 11th Street. There will be a bus shuttle between 9th Street and the Castro every 6 minutes during peak periods, and every 8 minutes mid-day. Bus shuttles will stop at F-line island stops.
Transfer from the F Market to the shuttle bus to the Castro at Market & 9th.
Transfer from the shuttle bus to the F Market at 8th & Market.