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San Juan River, New Mexico Hatch Chart

Insect Size Begin End
Midges 10-22 January 1 December 31
San Juan Worm 12-16 January 1 December 31
Scud 10-16 January 1 December 31
BWO 16-22 April 1 November 30
improvedgs-detail.htm Stonefly 12-16 June 1 August 31
Caddis 8-14 June 1 September 30
Hoppers 4-10 June 1 September 30
PMD 14-18 July 1 August 31

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