Bruce,
Wow, Angler #12. You must be a plank owner.
Here is the skinny on Skagit Humpies, and it isn't too much of a secret.
My spot that I fished when I lived in Bellingham was down in Burlington. Coming from the south, I would take the exit JUST PAST where you go over the Skagit. I know it is the Anacortes exit, I think exit 230. You can pick up all of your terminal tackle at the Holiday Market on highway 20. It is about 200 yards from the freeway on the west side as you head to Anacortes.
Once you pick up your gear, unless you already have it, head back into Burlington as if you were visiting the outlet mall, but just keep driving south on the main drag that parallels I-5 on the east side. Just before you get to the Skagit river there will be a right turn that will take you around and under the bridge. Now you should be heading due east. You will see a railroad bridge and a lot of people. Park there, get into the line, or even better, head west towards I-5 50 yards or so to get yourself out of the mayhem. You will still catch fish.
These directions may sound convoluded, but you can see the hole from the I-5 bridge where you cross the Skagit just by looking East (to your right). You want to fish between the railroad bridge, and the city street bridge. There are three bridges in a row, all in a half mile or less with the I-5 bridge being the western most.
It can be combat fishing, but most folks down there have been pretty decent in my experience. Nothing like some of the other meatholes out there.
The gear that I fished very successfully was as follows. I used a spreader bar, three way, made of wire (available usually at Holday Market, I miss that place
). I ran a pyramid weight, usually about 4 or 5 ounces, off of the bottom spot on the spreader with a swivel and 10 inches 6lb test. This way if you cast one off into oblivion or hang one up on the bottom, you have another one already rigged to just snap on.
I ran about 24" of 12lb leader to a hook, choose your size, with an egg loop. I preferred a pink winged bobber with one black wing, thanks to my sharpee. From there I attached a nice sand shrimp, and would cast upstream so that my line would come to rest in front of me.
Put the rod in a rod holder, along with a cowbell, so you can watch you son, and you're set. It is an easy method, less casting involved, and you don't lose too much gear. Just make sure that you have enough for at least 4 or 5 complete riggings for each rod you guys fish.
Go help your kid catch a fish, and let us know how you did.
Andy