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Mayfly Species Epeorus grandis

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Where & When


Region: West

Time Of Year (?): June through early August

Preferred Waters: Small streams

Altitude: Above 5,000 feet

Nymph Biology


Current Speed: Fast

Environmental Tolerance: Requires very cold streams



Pictures of 2 Mayfly Specimens in the Species Epeorus grandis:

Epeorus grandis Mayfly NymphEpeorus grandis Mayfly Nymph View 3 Pictures
Collected April 8, 2005 from Yellow Bay Creek in Montana
Added to Troutnut.com by Bnewell on June 27, 2011
Epeorus grandis Mayfly NymphEpeorus grandis Mayfly Nymph View 11 Pictures
Collected March 19, 2019 from the South Fork Snoqualmie River in Washington
Added to Troutnut.com by Troutnut on June 14, 2019

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