Water flows into the Minnesota River from a pipe connected to the Blue Lake treatment plant in Shakopee, MN, Monday Nov.12,2012. Phosphorus, the pollutant that sometimes made the lower Minnesota River an algae-filled dead zone, has been reduced so far tha

Water flows into the Minnesota River from a pipe connected to the Blue Lake treatment plant in Shakopee, MN, Monday Nov.12,2012. Phosphorus, the pollutant that sometimes made the lower Minnesota River an algae-filled dead zone, has been reduced so far that the river is healthy enough for fish, plants and other wildlife. The data, announced Monday, reflects a decade-long effort by the Minnesota Pollution Control Agency to force 40 sewage treatment plants along the last 22 miles of the Minnesota to reduce their phosphorus emissions.] JERRY HOLT • jerry.holt@startribune.com(Photo By Jerry Holt/Star Tribune via Getty Images)