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HEAD BREWER Greg Balch adds hops to the boil during brewing of the limited edition Collaborative IPA, which debuts (and will probably disappear) Saturday during Zwickelmania at the brewery at Fourth and Columbia streets.

Zwickelmania runs at five participating Gorge breweries from 11 a.m. to 4 p.m. with tours, beginning at 11:30 a.m. and the last tour going out at 3:30 p.m. at most locations.

An Oregon Collaboration IPA is the focus at participating breweries including Double Mountain, which hosted the brewing of the IPA last month.