10:20 AM: The parade is on! Just started, heading west from 44th and Sunset. The route turns east on Atlantic, which is where SPD will stop traffic so the parade can cross to Hamilton Viewpoint Park.
10:51 AM: The parade has finished crossing California and is headed into the park for sack races.
Seattle Fire Engine 29, which was part of the parade, is here for tours:
More photos, and some video, later!