UPDATE 12pm 7/6/12:
SDOT reports that the maintenance work scheduled for July 6 has been completed early. The ramp has been reopened.

Original post
press release
The Seattle Department of Transportation (SDOT) will close the westbound off-ramp to Admiral Way from the West Seattle Bridge tomorrow morning, Friday July 6, from 6 a.m. to 9 a.m. The closure, which was previously scheduled from 9 a.m. to 3 p.m., has been moved to the earlier time in order to take advantage of the lighter traffic volumes. Given this earlier time frame, the maintenance closure is expected to take no more than three hours.

During the closure, SDOT will detour traffic to Harbor Avenue, Avalon Way, SW Manning Street, and back to Admiral Way.