I did not know this about loons . We see a lot of them on Lake Montecello. " The feet of Arctic loons are too far back on their bodies for them to walk on land or, more critically, to take flight from land. Even small ponds or lakes are not ideal for take-off. I have read that it takes roughly 100 meters (330 feet) or so for loons to take flight from a body of water. As a result, loons typically use large lakes, bays, and coastal ocean waters during migration."
https://www.wunderground.com/cat6/It-Was-Raining-Loons?cm_ven=hp-slot-1