Big Daddy-

Below Bonneville Dam the water is rippin fast. You'll want to use a downstream swing style drift. Other people will be doing this all around you.

Best lure is a hot green floating jighead. 3' leader, 1' dropper with hollow core pencil lead pinced on so it will release when snagged. Bring lots of stuff-you'll burn up some gear getting the hang of it.

Here's a good link
http://www.wa.gov/wdfw/outreach/fishing/shad/shad.htm

Good luck!