Sierra Nevada 30th Anniversary Sierra Nevada Imperial Helles Bock Charlie Papazian and Fred Eckhart are the men who launched a thousand breweries. Their writing on the art of homebrewing and steadfast promotion of beer culture helped propel the craft brewing movement. Charlie and Fred agreed to work with us on this special ale in honor of our 30th anniversary. This Imperial Helles Bock is a testament to the ever-evolving brewers art. Bold yet balanced with distinct toasted malt character, moderate sweetness and clean and floral hops.