Lakeland, MN (KROC-AM News) - Tens of thousands of motorcyclists will be navigating the highways that run along both sides of the Mississippi and St. Croix Rivers between the Twin Cities and Winona for the 52nd annual Spring Flood Run.

What started as an effort by a group of about a dozen motorcycle enthusiasts to help with the clean up after the devastating 1965 flood, has become a major annual fundraiser for the Gillette Children’s Hospital. Last year, about 30,000 motorcyclists participated and raised over $129,000.

The event begins tomorrow morning at 8 o’clock at Shiner’s Bar and Grill in Lakeland, which is across the St. Croix River from Hudson, Wisconsin. It could be a soggy event. The National Weather Service is forecasting a better than 50/50 chance of showers and storms.

Law enforcement agencies along the routes used for the Flood Run will have officers on patrol, and motorists are reminded to be especially vigilant in keeping an eye out for motorcycles through the entire weekend.