It's basically the same every year, but the dates fluctuate.
The Spring Flood Run is always on the 3rd Saturday of April, unless that weekend happens to be the one with an Easter Sunday. In that case the run goes to the following weekend on Saturday.
The Fall Flood Run is always on the 3rd Saturday in September.
The run starting point is at the Beach Club Bar in Lake St. Croix Beach.
The ride usually starts gathering around 10:00 A.M. or so and departs in groups around noon or so. The times are pretty flexible and open.