I've never plunked near Vancouver but I think anywhere you can access the river is a possibility if the water is moving. If you have a vehicle, drive downstream and plunk at Willows or County Line park or anywhere along the way. There are some good seams at the mouths of the small creeks along the way too (that you can plunk).

Rays coon striped shrimp with a spin-n-glow.
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FEAR THE BEARD