Clarkson Construction Company is one of the largest and most diversified construction entities in the Midwest. Clarkson has a 50 percent ownership in Superior-Bowen Asphalt. Clarkson, in partnership with Ash Grove Aggregates, also operates a quarry company titled Johnson County Aggregates. The Clarkson family operates Everett Holding Company, which in turn operates Everett Quarries, an...