These are same-scale copies of the NOS charts and are handy and less expensive. I find them less clear to use because each chart is broken into several pages. Most of the facilities information is for commercial traffic. The tides reverse or slow the current on the lower Columbia. Topgraphical Maps This may seem odd for boating, but the nautical charts end just as many of the sloughs get interesting.
USGS maps are great.
A good overview of the rivers from Lewiston-Clarkston to the ocean. Only downside for me was that it had some glowing descriptions of some pretty seedy places.