The crash happened about 9:45 a.m., Washington State Patrol trooper Mark Francis said.
Traffic had slowed in the area after a vehicle crashed into a guard rail and came to rest facing the wrong way on the freeway.
A Bellingham woman on a Honda touring bike rear-ended a Volkswagen Touareg SUV that had slowed down for the spinout, Francis said.
The motorcyclist, 24, was ejected onto the top of the SUV. She landed in the middle of the freeway. The Honda VT750 caught fire.
Paramedics tried to save the woman. She died at the scene.
Troopers are investigating whether speed was a factor in the crash.
The Volkswagen driver, a 48-year-old Issaquah woman, was taken to a local hospital for minor injuries. A dog in her SUV was not hurt.
Traffic was backed up for miles while detectives investigated the accident.
Troopers encourage drivers and motorcyclists to use caution as they share the roads.
"We need a collective effort to watch out for each other," trooper Keith Leary said.
More Local News Headlines
Thousands mourn three fallen firefighters Power outages continue More support arrives to help solve Edmonds traffic problems Snohomish family is part of school funding lawsuit Woman missing for nearly two weeks found safe Generator likely spiked fire that leaves Edmonds home uninhabitable Man fatally shoots himself in Arlington after standoff with police Monroe seeks added revenue for upgrades to utilities
Our new comment system is not supported in IE 7. Please upgrade your browser here.