Nationwide Hatch Charts  (all major streams in the U.S. and Canada coming soon!)

Arkansas River  - Colorado
Ausable River - New York
Au Sable River - Michigan
Batten Kill, Vermont
Beaver Kill, New York
Big Hole River - Montana
Big Spring Creek - Pennsylvania
Big Thompson River, Colorado
Bitterroot River - Montana
Blackfoot River - Montana
Blue River - Colorado
Boardman River, Michigan
Cache La Poudre - Colorado
Cedar Creek, Pennsylvania
Clyde River, Vermont
Colorado River - Colorado
Connecticut River (Upper) - New Hampshire
Deerfield River, Massachusetts
Delaware River System, New York
Deschutes River (Lower), Oregon
Deschutes River (Upper), Oregon
Eagle River, Colorado
East River, Colorado
Elk Creek, Pennsylvania
Esopus River, New York
Fall River, Oregon
Falling Spring, Pennsylvania
Firehole River - Yellowstone National Park - Wyoming
Fishing Creek Pennsylvania
Frying Pan River, Colorado
Gardner River - Yellowstone National Park - Wyoming
Gibbon River - Yellowstone National Park - Wyoming
Great Smoky Mountains National Park -Tennessee and North Carolina
Green River, Wyoming
Green Springs, Pennsylvania
Gunnison River, Colorado
Gunnison River - Black Canyon - Colorado
Henry's Fork of the Snake River - Idaho
Hiwassee River - Tennessee
Housatonic River, Connecticut
Klamath River, Oregon
Lamar River - Yellowstone National Park - Wyoming
Letort Spring Run, Pennsylvania
LIttle Bushkill, Pennsylvania
Little Lehigh, Pennsylvania
Little Manistee River, Michigan
Little Schuylkill River, Pennsylvania
Madison River - Downstream of Hebgen Lake, Montana
Madison River - Yellowstone National Park - Wyoming, Montana
McCloud River (Upper), California
McKenzie River, Oregon
Metolius River, Oregon
Missouri River Tailwaters, Montana
Mitolius River, Oregon
Monture Creek, Montana
Neshannock Creek, Pennsylvania
Neversink River, New York
Noontootla Creek, Georgia
Northfork River, Arkansas
North Platte River, Wyoming
Penns Creek, Pennsylvania
Penobscot River, Maine
Pere Marquette River, Michigan
Potomac River (North Fork), Maryland
Provo River, Utah
Ridley Creek, Pensylvania
Roaring Fork, Colorado
Rock Creek, Montana
Ruby River, Montana
Sacramento River (Lower), California
Sacramento River (Upper), California
San Juan River, New Mexico
Savage River, Maryland
Seneca Creek, West Virginia
Shenandoah National Park - Virginia
Silver Creek, Idaho
Slough Creek - Yellowstone National Park
Smith River, Virginia
South Fork of the Snake River, Idaho
South Holston River, Tennessee
South Platte River, Colorado
Spring Creek, Pennsylvania
Spruce Creek, Pennsylvania
St. Vrain River (Creek), Colorado
Taylor River Colorado
Tobyhanna Creek, Pensylvania
Tulpehocken Creek, Pennsylvania
Uncompahgre River, Colorado
White River - Arkansas
Whitetop Laurel Creek, Virginia
Willowemoc Creek, New York
Yakima River, Washington
Yellow Breeches, Pennsylvania
Yellowstone River - Outside Yellowstone National Park, Montana
Yellowstone River - Yellowstone National Park - Wyoming
Copyright 2012 James Marsh
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How to Read A Perfect Fly Hatch Chart:
Hatch Rating:
The hatch rating is provided to give anglers an idea
as to the availability of an insect or what the trout are
most likely feeding on. It is not a rating of importance.
An insect with a one * rating may be more important
than anything else at a particular time of the year,
month, day or hour. A ***** rating simply means there
usually are a lot of the insects available. This doesn't
necessarily mean that the insect is available any and
everywhere on the stream. It is available only where
the insect's preferred habitat exists on that stream. If
the trout are feeding on an insect with a * star rating
and it is the most available insects at the time, it is
very important. What is important is what is hatching at
the time you are there fishing.

Concentrations:
On any given stream there may be hundreds of
different species of aquatic insects that exist in some
quantity. Some species may occur only in certain
isolated areas of the stream. We are listing what we
believe are the most prevalent and important hatches
that anglers should be concerned with. Although the
density of any hatch can vary drastically, the hatches
are noted as ”dense, normal or sparse” in order that
you have a better idea of what to expect.    

Stream Habitat:
The species we list are usually not concentrated
throughout the entire stream, only in the portions of
the stream that offer the proper habitat. For example,
if a certain stonefly hatch is shown on a river that is
thirty miles long, don’t expect to find them at the lower
end of the river in pools of slow moving water
unsuitable for stoneflies. Also, you should be aware
that hatches could progress upstream from day to
day, especially on those steams with steep
declinations, so they may occur at different sections of
water from day to day.    

Weather Variations:
Remember that seasonal weather conditions can
change the dates that hatches actually occur from the
predicted time periods the charts indicate. An
unusually cold year may delay a hatch a week or two,
in some cases, even longer. However, the sequence
in which the different specie hatch will generally occur
in the same order.

Preparation:
Prior to fishing any given stream, you should make a
list of the insects and other trout food shown on the
hatch guides along with the recommended flies that
imitate them for the time period you intend to fish.
Make some allowances for the indicated time period,
just in case. In other words, if a certain insect is shown
to start hatching on March 1 and you are fishing
February 26th, list it.

Pre-Hatch Importance:
Do not forget that the charts show the predicted
“hatch” dates. Normally, the nymph or larvae, and
pupa stages of the insects are available for trout to
eat well in advance to those dates. In fact, in many
cases, depending on the particular species, the
insects are much more important to the angler prior to
the hatch than they are after the hatch occurs.