Copyright 2013 James Marsh
Hatches and Flies for Big Gunpowder Falls River, Maryland
The Big Gunpowder Falls River flows through a lot of limestone rock creating a good pH level.
This means there are a lot of aquatic insects available for the trout to eat. Little Winter
Stoneflies are the first insects to hatch. Midges hatch throughout the year and provide the
best opportunity to catch trout during the winter.
From about the middle of March through the month of May, Blue-winged Olives are the main
aquatic insect that hatch. These are mostly baetis species. They hatch again starting about
the first of August and lasting until near October. Some of these are small BWOs and little
BWOs. They will vary from hook sizes 16 down to a size 24.
Around the middle of March Little Black Caddisflies, or Grannom Caddis, start hatching along
with some Blue Quill mayflies. The caddis hatch last just over a month. The Blue Quills can last
almost two months. Little Brown Stoneflies will start hatching about the middle of March and
last over a month.
The Hendrickson hatch starts about the middle of April. The hatch will last about a month.
By the first of May, you may find some large Eastern Green Drakes and even a few Brown
Drakes. They hatch for about three weeks. There are a few Eastern Pale Evening Duns that
start near the end of April. The American March Browns and the Light Cahills both start
hatching around the middle of May. Both of these will hatch for almost two months.
The first of May will also start the first Green Sedge hatch and the Short-horned Sedge hatch.
Both hatches last about a month. Most of the caddisflies will be Cinnamon and Spotted
Sedges. They hatch from mid-May until the end of August and provide some of the best
opportunities to catch trout on the dry fly.
Sulphurs start the middle of May and can last for a month and a half. This is one of the Big
Gunpowder Falls River's best and most consistent hatches.
By the middle of June, terrestrial insects can become important. Ants, beetles and grass
hoppers imitations will catch trout. Don't forget the streamer flies. They can produce anytime of
the year, especially early and late in the day or when the water is stained from heavy rains.
It is far better to select the flies you need with you from the hatch chart than to use generic or
attractor flies. We have the World's best trout flies that will match the hatch any day of the year
on the Big Gunpowder Falls tailwater. If you haven't tried them already, we encourage you to
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Big Gunpowder Falls
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