Shakopee police are asking for help finding 37-year-old Eric Michael Lindquist.
Lindquist was last seen Tuesday night and is believed to have walked from his house to Memorial Park to go fishing on the Minnesota River.
Bruce Lindquist and his brother have spent several hours scouring the paths along the river, looking for any sign of his missing son.
"This is really bad," he said. "Any parent who has been through any kind of waiting to find out word on a son or daughter -- to learn their fates -- knows it's excruciating."
The troubled father believes his son walked from the townhome they share in Shakopee to the river on Tuesday evening, taking his auger and fishing gear to Veterans Memorial Park a few blocks away to go ice fishing at his favorite spot.
Bruce Lindquist said his son loves the outdoors and recently sold his two snowmobiles to take up the winter sport of fishing. Now, he fears his son may have fallen through the ice while trying to enjoy his new passion.
"I'm afraid he might be out there somewhere and we can't get to him and can't help him," Lindquist said. "It's such a big question that it bothers me greatly."
Rescue crews used a hovercraft and divers to search the river on Thursday. The night before, a State Patrol helicopter was brought in -- but no sign of the 37-year-old long haul trucker has been found. The subzero temperatures are adding a sense of urgency to the efforts as well.
Eric Lindquist is 6'0, 180 lbs with brown hair and blue eyes. He is believed to be wearing a dark blue or black jacket with a hood and baggy blue jeans.
According to Bruce Lindquist, even though his son is an independent person, it is very unlike him to disappear without letting someone know where he is. So far, he is hoping the fact that searchers haven't found his son is a sign that he may eventually turn up OK.
"You have to assume the worst and hope for the best," he said.
Anyone with information is asked to call the Shakopee Police Department at 952-233-9400. Anonymous tips can be sent to http://tiny.cc/SPD_TIP411 or text the word "spdtips" and information to 847411.