This is a wonderful area of cliffs, rocky islands, trees, and currents between Hebb County Park and Willamette Park in West Linn just upstream from Willamette Falls (https://firstname.lastname@example.org,-122.6616025,15z). It's a favorite paddle spot for many of us.
At lower water you will find currents up to 2-3 knots and a lovely paddle, while at high water it can be a raging, swirling mess and potentially quite deadly.
Here are my observations in different conditions
David had this to say about the Narrows: I have paddled the narrows from calm water on warm sunny days, to 62' on the gauge above the falls a couple winters ago. I've found that from 58' to 62' the narrows can be an excellent place to work on ferrying, exiting and entering eddies, and even a little surfing and playing in confused waters. At 64'+ I wouldn't recommend this for anyone who doesn't have solid skills in fast moving current & rough water.
Don't go downriver from Willamette Park in West Linn - you don't want to get close to Willamette Falls!
Oregon Ocean Paddling SocietyPortland, Oregon