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Clark Fork River, MT Hatch Chart

Insect Size Begin End
Midges 20-24 March 1  October 31
Olive Stone 12-14 March 1 May 31
Gray Drake 12-14 March 1 May 31
Caddis 14-18 March 15 August 31
Green Drake 10-12 June 1 July 15
BWO 16-20 March 5 June 5
Salmonfly 4-6 May 15 June 30 
BWO 16-20 August 15 October 31
Pale Evening Dun 14-18  June 15   August 31
Yellow Sallies 14-16 June 15  August 31
PMD 14-18 June 15 September 15
Trico 20-24  July 15 September 15
Callibaetis 14-16 July 15 September 30
Green Stones 14-16 July 15 August 31
Mahogany 14-16 August 31 October 31
Tricos 20-24 July 15 September 30
Hoppers 8-10 July 15 September 30

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