Stewart/Hyder is worth the side trip. The Salmon Glacier is only one we found that you can drive above the glacier and look down. The gravel road is maintained by the mining companies and probably not suitable for a 2WD car.
Hyder and Salmon Glacier.Second Alert: Fuel was more expensive along the long stretches of the Cassiar in 2013. The only fuel station in Stewart had a 10.5' overhead.
Third Alert: In 2013 earlier travelers along Cassiar were invited to spend days waiting for the flooded road to clear. But weather and road conditions change all the time...