I-35W bridge de-icing system

  • Graphic by: STAR TRIBUNE
  • Updated: August 22, 2007 - 8:51 PM

This is how the automatic de-icing system on the bridge worked when it was installed in 1999. MnDOT said Wednesday that the chemical used, liquid potassium acetate, is "environmentally friendly, less corrosive to steel and concrete and has a low freeze point."

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