Ice Coverage on the Laurentian Great Lakes
April and later ice cover is primarily on Lake Superior, since this lake is in the coldest region and also because it is the largest lake.  

Raymond Assel analyzed the Great Lakes ice coverage for the winters of 1897-1982 in AN ICE-COVER CLIMATOLOGY FOR LAKE ERIE AND LAKE SUPERIOR FOR THE WINTER SEASONS 1897-1898 to 1982-1983 INTERNATIONAL JOURNAL OF CLIMATOLOGY, VOL. 10,731-748 (1990).

According to table IV of Assel, in the winter of 1911-12 Lake Superior had an ice cover of 80% or greater for 74 days.  No other winter had more than 52 such days.

According to this NOAA file in the winter of 2013-14 Lake Superior has an ice cover of 80% or greater on 68 days.  

Assel also studied Lake Erie, and finds that 1911-12 had 72 days with 80% or greater ice cover.  This compares to 70 such days in 2013-14.

Based on the above, it is very likely that 1911-12 was the most recent winter with similar April ice cover to 2013-14.