I used to hate it when that route got shut down; I worked in Brentwood (West Los Angeles) and commuted north via the Sepulveda Impasse.....when the coastal commuters had to take the long way around, they'd join the already clogged 405 and we'd just inch along.
It sucked then, and I'm sure it sucks more now, two and a half years later.
Sepulveda is flooded out at Venice Blvd. according to latest on KFI.