"Near Lynnwood" is the part that will get you zero results. Maybe something out HWY 2 towards Gold Bar? That would be the closest I could think of. There are also some places out by Granite Falls but within 1/2 hour is a very tall order.
I live in Lynnwood as well and do all my shooting in Rockport at the family owned rock quarry...which is nice because the equipment is available to us to move berms as we see fit. For all that luxury though I must drive 1hr 40min. That is, until I move closer in the next couple months.
I just realized my post doesn't help you one bit. My apologies.