If I remember correctly, the Coast Guard pulled the last navigation buoy 10 or 15 years ago, as it became too dangerous for them to send the buoy tender in to reset them. I don't think the channel has been dredged in 40 or 50 years. I've been over it, and if you learn it, it can be as easy as the Columbia. If you can read water well, and have some common sense to be able to pick your way through, it's not a problem. Use the north channel. The middle channel is sketchy on a good day. Best bet might be to find a local that will take you out a few times, or at least let you follow so you can lay down a track line. Just remember, that line will change a little or a lot after every big storm or big tide cycle. Be safe, and have fun.