Ice surveys on Lake pepin
The Corps of Engineers, St. Paul District ice survey team uses an airboat in the Mississippi River, near Lake City, Minn., Feb. 27, to measure the ice thickness within Lake Pepin. The Corps of Engineers measures the ice thickness every spring and the navigation industry uses the information to determine when to break through the ice and begin the shipping season. Lake Pepin ice is traditionally the last hurdle for the navigation industry to deal with before reaching St. Paul, because the ice is usually a lot thicker in the lake due to the slow moving current.

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Photo by: Patrick Moes |  VIRIN: 140227-A-LI073-951.JPG