You are bang on! Below the dam in Castlegar is the place to be for walleye. There are however other places to go in the area for walleye like Erie Lake east of Fruitvale, B.C. Be very careful on the Columbia River when boating or wading. It's scary at times. As much as I like this You will also want to check out BC's other famous fishing forum and do a search for "walleye" and/or the Columbia River. That forum has a more extensive body of literature (if I can use that word). Try this link. Perhaps this thread should be moved to the Kootenays?