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The hexagenia limbata commonly referred to as simply the “hex”, the largest of the mayflies in the northwest. These mayflies are 1-2 inches long and once a year they hatch by the thousands on one of our local favorite fly fishing only lakes, Merrill Lake.

The hatch generally starts sometime in early July, and stretches through late August. The hatch is triggered by the hot summer days. This is one time of the year when the lakes lunker browns and wary rainbows lose caution when munching on the large insects making them an easier target for the angler.

The hexs begin emerging about an hour before dusk and will last several hours into darkness. Nymphs can be fished along the bottom before the bugs start coming off the water but when you see the bugs swarming all around you theirs your sign to change to the top water. Using an emerger cripple imitation can be especially productive due to the actions the bugs make trying to rid their nymph shell and dry their wings before being devoured and also a dun hex paradrake. If you don’t have any of the specific imitations try large sparkle duns, cripples, or adams flies. The hexs are very bright, they have yellow bodies, and a little yellow in their wings. So any similar shaped fly with yellow should produce. One of my favorite areas to fish in the lake is off the east shoreline, sticking pretty close to the shore. The shrubs growing in the water provide a good place for the bugs to thrive. But you will most likely find them emerging from the water on all parts of the shoreline. It is truly amazing watching the water bubble with huge mayflies trying to dry their wings and fly away, and watching the fish bringing death from below smashing the mayflies time after time. Last year I brought my girlfriend out for the hatch and she isn’t a veteran fly fisher by no means, and she even ended up landing 4 fish in one evening, in my opinion it is by far the best time to fish at Merrill. But I do warn you to be ready for a lot of false hook sets, and curse words to be shouted.

Good luck, see you out there.
-tight-lines.

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