Often mayflies can be found on houses near the river.  This one molted from a dun into a spinner on the outside of our kitchen window.

Any lit dwelling near the river can attract a lot of mayflies at night.  A good way to determine what's hatching is to visit a gas station (or anything else with bright lights) close to the river early in the morning. From the West Fork of the Chippewa River in Wisconsin.
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Often mayflies can be found on houses near the river. This one molted from a dun into a spinner on the outside of our kitchen window.

Any lit dwelling near the river can attract a lot of mayflies at night. A good way to determine what's hatching is to visit a gas station (or anything else with bright lights) close to the river early in the morning.

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