1906 Heron Lake Hunting Agreement, The earliest private use of a combination of regulations can be traced to the historic Heron Lake agreement of 1906. The official agreement by the lake's hunters and club members, then totaling 36, was to restrict shooting hours and maintain refuge status of the open water by restricting boat traffic and open-water hunting. The intent was to extend opportunity for all throughout the season and is still in effect today. Bellrose reported in 1944 that the most important disturbance and the one that caused ducks to avoid or leave an area was shooting in the pre-dawn or late-afternoon darkness.
~Judy Nelson, Lakefield, MN