The ice on Lake Pepin continues to be in excess of two feet in several locations.
The latest survey taken by the U-S Army Corps of Engineers this week showed the ice is still 32 inches thick just above Reads Landing. That includes 27 inches of solid ice and 5 inches of white ice or snow that has air bubbles.
Nine other sites above Reads Landing registered between 24 and 29 inches thick, including the so-called white ice with bubbles.
That means the shipping season on the upper Mississippi will be delayed until a towboat can make it through Lake Pepin to St. Paul.
Towboats usually arrive at the Winona commercial harbor first and some proceed further north.
No towboats have been trying to make it any further north than southern Iowa. The nearest towboat, the Ardyce Randall, passed through Lock and Dam 14 at Pleasant Valley, Iowa, Friday morning pushing nine barges upbound.