Dan DeVaney, survey technician with the project office in Fountain City, Wis., measures 29 inches of ice at mile 771 of the Mississippi River during the annual icesurvey at Lake Pepin on Feb. 21, 2018. Measurements are taken here – at the widest, and slowest-moving segment of the river – to help the shipping industry prepare for the beginning of the navigation season.

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Photo by: Patrick Loch |  VIRIN: 180221-A-CQ961-005.JPG

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