Respawn --- The mouth of the Lewis is perfect for boats of any size. Many use 12-footers, many employ 21-ft sleds, and everything in between.
Put in at Beebe's just 500 yards up the Lewis, or at St. Helen's across the Columbia river. There are many other launching spots.
Fish on the outgoing tide using the St. Helens table. Plan to anchor or troll spinners, spinner prawns or flatfish (red or orange, sizes from F-7 through X-4, X-5 or U-20) using a spreader or a slider, 4 ft leader, 2-3 ft lead line. Stay on or near the bottom at all times, using enough lead to keep your rig close to the boat. If you anchor, do it well away from the trollers. Many folks who anchor use flatlined flatfish (no weight, 50 feet behind the boat).
Post here if you need directions. And if you see an old fart in a dumb Grumman jon boat, stay out of his way. He will shortly have a fish on.