First Readings for 2026 are expected Mid - late February
Composite 12-Year measurements from 2014-2025
Map: Lake Pepin ice survey locations (PDF)
Lake Pepin ice thickness measurements typically start in mid-February and are conducted on a weekly basis. Measurements are reported from each mile on the Upper Mississippi River between mile 765 and 786. These measurements are taken at the points indicated on the map and the ice thickness is valid for that location only.