my editor's brain sees an audio waveform

From summer 2013 on the Yukon River, downriver from Rampart, Alaska.  It's close to midnight and it won't get any darker. The river is about one kilometre in width here and the current has barely picked up since leaving the Yukon Flats. For what this river lacks in whitewater it makes up for in landscapes so stunning they make you forget the simple task of operating a canoe. We nearly flipped.