The Minnesota River valley could look different in a few years...and the river water may be much cleaner. What may be the most concentrated effort ever in Minnesota to clean a river is set to begin this spring..... assuming the U.S. Agriculture Department okays the state/federal effort. That approval is expected this month. The goal is to reduce the amount of agricultural run-off entering the river. Mainstreet Radio's Mark Steil reports: This southern Minnesota field doesn't look much out of the ordinary with its spikes of brown grass poking through ice-encrusted snow: SOUNDS OF FOOTSTEPS FADE UP UNDER PREVIOUS :11 (We got good snow cover out here, we're looking