Des Moines Register: Iowa's most acclaimed brewery could be headed to Des Moines. Decorah's Toppling Goliath Brewing Co. released a public proposal Monday asking developers to consider housing a permanent brewery and taproom in the capital. Iowa's most-acclaimed brewery could be headed to Des Moines. The site criteria in the proposal includes 15,000 to 20,000 square feet of indoor space to house both a taproom and brewery and at least 3,000 square feet of outdoor bar space in the Des Moines metro.