Then, the Connoquenessing flows into the Beaver River just three miles south from the mouth of Slippery Rock.

In one story, the indigenous Seneca Indians called the creek Wechachapohka or "Slippery Rock", denoting the rocks at the bottom of the stream that could be easily crossed by natives wearing moccasins but not by soldiers wearing heavy boots.

[6] In another more prosaic story, the Native Americans coined the name due to natural oil seeps in and around the present-day McConnells Mill State Park that made the rocks slippery; those seeps were later eliminated by fossil fuel extraction.

With Class-II and -III rapids and engaging beauty, it attracts regular paddlers from novice to advanced level.

The rocks are indeed deceptively slippery, and throughout the year, there are numerous reports of drowning incidents, mostly near the McConnells Mill State Park.