Last week, Forbes magazine ranked Williamson County America’s fastest-growing county . Although Williamson County’s 7.94 percent growth rate has had positive impacts on its economy, the boom has put a strain on existing infrastructure. Yesterday, Williamson County voters responded by approving two bond packages aimed at helping county infrastructure keep up with growth. The two propositions: Prop 1, adding $275 million to the county’s budget for road improvements and construction, passed with 64 percent of the vote. Prop 2, earmarking $40 million to upgrade the county’s park system, passed with nearly 55 percent.