The "Slack Water" Mountain Range of the Pacific Northwest

I love the Pacific Northwest and, although born and residing now in California, I really feel like Oregon is my home. I was cruising through Wikipedia a few days ago looking at pictures of the mountains familiar to me (the Sisters are above) when I came across a reference to how the Cascade Range got its name. Apparently, a doctor on Vancouver's ship noted the proximity of the rushing cascades of the Columbia River to St. Helens, Hood and Adams and began to call them the "Cascades". The name stuck. Now to the irony. Today the cascades of the Columbia are nothing more than slack water behind the Bonneville Dam. I guess the only thing to do is rename the range ......