The summer season is beginning, and with it comes river recreation of all kinds in the Roaring Fork Valley. In our area, we’re used to roaring rivers and thrilling rapids. But, in other communities, rivers that once roared are still and quiet now. And, it’s a problem. An engineering firm in Glenwood Springs is working to put the rapids back in rivers damaged by human intervention. Aspen Public Radio’s Marci Krivonen has more.