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Henry's Fork, Idaho Lower Hatch Chart

Insect Size Begin End
Midge 18-22 January 1 March 30
Caddis 14-16 March 1 June 30
BWO 16-24 March 1 November 30
Giant Stonefly 4-6 May 15 June 15
Brown Drake 10-14 May 15 June 15
Western Green Drake 10-14 June 1 July 15
Small Golden Stone 8-12 June 1 July 15
PMD 16-20 June 1 September 15
Golden Stone 4-6 June 1 July 31
Mahogany Dun 16-18 August 1 September 30
Gray Drake 10-12 August 15 September 15
Midge 18-22 November 1 December 31
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