Michigan Trout Streams Emergence Schedule

Compiled by John J.P. Long for The Challenge Chapter - Trout Unlimited
"X" Denotes Peak Period

SIZE

NAME

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

NOV

18/20

Allocapnia granulata or vivipara
Tiny Early Winter Black  Stonefly

****

****

****

-

-

-

-

-

-

-

-

16/20

Nemouridae and Leuctridae
Tiny Late Winter Black Stonefly

-

*

****

****

-

-

-

-

-

-

-

10/14

Taeniopteryx nivalis
Early Black Stonefly

-

*

****

****

-

-

-

-

-

-

-

12/14

Brachyptera fasciata
Early Brown Stonefly

-

-

**

****

*

-

-

-

-

-

-

18/20

Baetis vagans
Blue Wing Olive Mayfly

-

-

-

***

X***

*XX*

****

***

-

-

-

16/18

Paraleptophlebia adoptiva
Slate Wing Mahogony  Mayfly

-

-

-

**

XX**

****

-

-

-

-

-

12/14

Ephemerella subvaria
Dark Hendrickson Mayfly

-

-

-

**

XX*

-

-

-

-

-

-

16/18

Chimarra aterrima
Little Black Caddis

-

-

-

**

XX**

****

****

****

-

-

-

12/14

Leptophlebia cupida
Borcher's Drake Mayfly

-

-

-

*

****

****

****

**

-

-

-

14/16

Brachycentrus americanus
Grannom Caddis

-

-

-

*

****

****

****

-

-

-

-

2/8

Pteronarcys dorsata
Midwestern Salmon Fly  Stonefly

-

-

-

*

****

****

**

-

-

-

-

10/18

Rhyacophilidae fenestra
Green Rock Worm Caddis

-

-

-

-

****

****

-

-

-

-

-

8/14

Perlodidae lsogenus and lsoperla
Medium Brown Stonefly

-

-

-

-

****

****

****

-

-

-

-

10/14

Siphloplecton basale
Great Speckled Olive Mayfly

-

-

-

-

*XX

****

**

-

-

-

-

14/20

Hydropsyche bronta and simulans
Net Building Caddis

-

-

-

-

***

****

****

****

****

****

-

16/18

Ephemerella dorothea
Sulphur Dun Mayfly

-

-

-

-

**

XXX*

*

-

-

-

-

14/18

Alloperla caudata and imbecilla
Little Yellow and Little Green Stonefly

-

-

-

-

**

****

****

****

****

****

-

14/16

Nectopsyche
White Miller Caddis

-

-

-

-

**

****

****

****

****

****

-

20/22

Baetis cingulatus
Blue Wing Olive Mayfly

-

-

-

-

**

****

****

****

-

-

-

14/16

Ephemerella invaria
True Hendrickson Mayfly

-

-

-

-

*X

X***

***

-

-

-

-

14/16

Ephemerella rotunda
Light Hendrickson Mayfly

-

-

-

-

**

***

-

-

-

-

-

10/12

Stenonema vicarium
American March Brown Mayfly

-

-

-

-

**

****

**

-

-

-

-

12/14

Stenonema fuscum
Sand Drake Mayfly

-

-

-

-

*

XX**

**

-

-

-

-

12/14

Siphlonurus rapidus
Early Gray Drake Mayfly

-

-

-

-

*

X**

-

-

-

-

-

10/12

Ephemera simulans
Brown Drake Mayfly

-

-

-

-

*

XX**

*

-

-

-

-

8/10

Phryganlidae ptilostomis
Great Orange Sedge Caddis

-

-

-

-

-

****

****

-

-

-

-

8/12

Green Oak Worm/Greenie Worm
Caterpiller

-

-

-

-

-

*XX*

*

-

-

-

-

20/28

Diptera
Midges

-

-

-

-

-

****

****

****

****

****

-

10/12

Isonychia sadleri
Mahogany Dun Mayfly

-

-

-

-

-

**X

XX**

-

-

-

-

6/8

Hexagenia limbata
Great Olive Winged Drake Mayfly

-

-

-

-

-

**X

X**

-

-

-

-

10/12

Isonycha bicolor
White Gloved Howdy Mayfly

-

-

-

-

-

***

****

****

***

-

-

12/14

Stenonema canadense
Light Cahill Mayfly

-

-

-

-

-

**

****

*

-

-

-

10/12

Sephlonurus alternatus
Late Gray Drake Mayfly

-

-

-

-

-

**

XX**

-

-

-

-

10/12

Ephemera varia
Golden Drake Mayfly

-

-

-

-

-

**

****

*

-

-

-

6/8

Paragentina media
Big Golden Stonefly

-

-

-

-

-

*

****

*

-

-

-

14/18

Ephemerella lata
Slate Winged Olive Mayfly

-

-

-

-

-

*

****

***

-

-

-

22/24

Pseudocloen anoka
Tiny Blue Winged Olive Mayfly

-

-

-

-

-

*

****

****

****

-