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Figuring our Fishing

Hatches

Lakes | Rivers

This emergence index is based on 30 years of monitoring Northern Sierra waters. Cool weather may slightly delay the hatch and warm weather can slightly advance it. Combine this index with flow information to plan your trip. Click into resources to fine-tune your experience and go to flies for more information on pattern selection.

Truckee River flows (optimum 200-400 cfs) Little Truckee flows (below Stampede) (optimum 150 cfs)

N.Fork Yuba flows (optimum 300) EF Carson Flows (optimum 200 cfs)

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Main Hatches Minor Hatches Sporadic Hatches

Truckee Area Lakes

PROPER NAME COMMON NAME SUB ADULT ADULT SIZE MAY JUN JUL AUG SEP OCT
Callibaetis Speckled Dun Mayfly Pheasant Tail BiVisible Dun
Grey Cripple
12-18 ** *** ** * * **
Siphlonurus Grey Drake MayFly Birds Nest BiVisible Dun
Grey Cripple
10-12 * *** * * * *
Caenis Snowflake Dun Mayfly Pheasant Tail Sparkle Dun 20-22 * ** *** ** *  
Tricorythodes Trico Mayfly Pheasant Tail BiVisible Dun 20-22 * ** *** ** * *
Phryganea Motor Boat Caddis Teichert Caddis E/C Caddis 10   ** *** *** *  
Mystacides Black Dancer Caddisfly Pheasant Tail
Birds Nest
E/C Caddis 14-16   ** *** *    
Zygoptera Damselfly Marabou Damsel Braided Butt Damsel 8-14 ** *** *** ** ** *
Anisoptera Dragonfly Geirach Dragon   6-10 ** *** *** *** **  
Chironomus Blood Midge Brassie Martis Midge 14 *** *** ** * * **
Gammarus Scud Birds Nest Birds Nest 10-16 * ** *** *** **
Various Snail Floating snail Floating snail 6-16 * ** *** *** ***

 

Truckee Area Rivers and Streams

PROPER NAME COMMON NAME SUB ADULT ADULT SIZE MAY JUN JUL AUG SEP OCT
Ameletus Slate Wing Dun Mayfly

Birds Nest
Pheasant Tail

Brown Cripple 10-12 **          
Heptagenia Blue Wing Olive Mayfly Soft Hackle

Birds Nest
BiVisible Dun
Cripple
12-16 ** *        
Rhithrogenia March Brown Mayfly Soft Hackle

Birds Nest
BiVisible Dun
Cripple
12-14 **          
Epeorus Sulfer Mayfly Pheasant Tail
GR Hares Ear
BiVisible Dun
Humpy
14-18   *** **      
Cinygmula/Cinygma Red Quill Mayfly Birds Nest
GR Hares Ear
BiVisible Dun
Humpy
16/ 18 ** ** *      
Baetis Blue Winged Olive Mayfly Pheasant Tail
GR Hares Ear
BiVisible Dun 18-24 *** * * * * ***
Paraleptophlebia Mahogany Dun Mayfly Pheasant Tail
GR Hares Ear
BiVisible Dun
Cripple
14-18 ** ** *      
E. Tibialis Creamy Orange Mayfly Birds Nest

Pheasant Tail

GR Hares Ear
BiVisible Dun
Cripple

Humpy
14-16 ** *** ** *    
E. Flavilinea Flav MayFly Birds Nest
GR Hares Ear
Green Cripple
Humpy
12-14   ** **      
E. Infrequens E. Inermis Pale Morning Dun Mayfly Birds Nest
Pheasant Tail
GR Hares Ear
BiVisible Dun
Tan Cripple
Humpy
14-16 18 ** *** *** *    
Drunella Grandis Green Drake Mayfly Birds Nest
GR Hares Ear
BiVisible Dun
Humpy
10 * *** *      
Rhyacophila Green Sedge Caddisfly Rockworm
Sparkle Caddis
E/C Caddis
Z Wing Caddis
12-18 * *** *** ** *  
Hydropsyche Spotted Sedge Caddisfly Rockworm
Sparkle Caddis
E/C Caddis
Z Wing Caddis
12-18 * *** *** ** *  
Glossosoma Saddle Case Caddisfly Rockworm
Birds Nest
Bird Nest
E/C Caddis
16-18 * *** *** *    
Brachycentrus Grannom Caddisfly Pheasant Tail Birds Nest
E/C Caddis
10-18   ** ** **    
Dicosmoecus October Caddis Red Squirrel Madam X
Stimulator
6-8         ** ***
Gammarus Scud Birds Nest Birds Nest 10-16 * ** *** *** **
Calineuria Golden Stonefly Birds Nest Madam X
Stimulator
4-8 ** **        
Isoperla Little Yellow Stones Birds Nest Little Yellow Stonefly 10-18 *** ***