.......................  ......Fly Fishing Yellowstone National Park

07/02/11

Flies You Should Have Now For Yellowstone Park Streams

Blue-winged Olives:
In every stream in the park in various species and a must for any fly box
Hook Size 16/18
nymph
emerger
emerger w TS
dun
spinner

Green Sedge:
These larvae are free-living and eaten by trout year-round. They work anytime on any stream
in the park. Use pupa and adults if you encounter a hatch but the lava imitation anytime.
Hook Size 14
larva
pupa
adult

Spotted Sedge:
The most plentiful caddisfly in the park. Several species of them so don't get caught without
imitations. Fish larva during non hatch times and pupa and adults very late in the day. All of
the streams have them.
Hook Size 14/16
larva
pupa
adult

Little Yellow Stonefly (Yellow Sally):
Both nymphs and adult imitations are a must. Fish nymphs anytime and adults only when
you see egg laying activity. All fast water streams.
Hook Size 14
nymphs
adults

Little Sister Caddisflies:
Second most plentiful caddisfly in the park. Fish the larva anytime and pupa and adults only
when you find them hatching. In all but the very fast water streams.
Hook Size 18
larva
pupa
adults

Western Green Drakes:
If they are hatching and you don't have them, you've had it. Mostly moderate water streams
but also moderate water pockets of fast water streams. Fish the nymph anytime and the
emergers, duns and spinners only when you find them hatching.
Hook Size 12
nymph
emerger
emerger w TS
dun
spinner

Golden Stoneflies:
These large stoneflies exist in all fast water areas of the park. Fish the nymph late in the day
near the banks and the adults only when you see them laying eggs. A must if you find them
hatching.
Hook Size 10
nymphs
adults

Salmonflies:
These large stoneflies exist in all fast water streams in the park. Fish the nymphs along the
banks up until egg laying begins and then switch to the adult pattern. A must if they are
hatching.
Hook Size 4/6
nymphs
adults

Gray Drakes:
You have lower odds of finding a hatch but a must when you do. These mayflies prefer
almost still to moderately slow moving streams like Slough Creek. The spinner is the most
important stage to match.
Hook Size 10
nymphs
spinners

LIttle Short-horned Sedge:
A grossly overlooked caddisfly that are in just about all the streams in the park. Tiny, hard to
see, but deadly during a hatch.
Hook Size 20
pupa
adults

White Miller:
In the streams where they exist like the Firehole and Madison River, they are very important
and hatch in huge quantities. Fish the pupa during the hatch and the adult when late in the
day and evenings when the egg laying is occurring.
Hook Size 16
pupa
adults

Streamers:
A must to have anytime its very early in the day or the water is off color. Have a good selection
imitating sculpin, leeches and baitfish.
Hook Sizes 6/8/10/12