I grew up(partially)in LaCrosse. They were attracted to the lights on the bridge over the Mississippi river. Used graders to remove them(think snow plows). Only for a day or two. They were all over town far from the river.reible wrote:Speaking of Mayflies, WI has it share of them. Here are a few videos to let you have a feel for what it looks like when they hatch.
https://www.youtube.com/watch?v=Nz_gAjp3zYc
https://www.youtube.com/watch?v=HcsR2aLx0D4
https://www.youtube.com/watch?v=CnqmSqYUYLU
Ed
Yes it got slippery on the bridge.
Accidents 'happened' on the sloping ramps to the bridge.