Filling 500 jobs in two months: Colorado's low unemployment rate is leaving parks and rec districts short-staffed for their busiest season Lifeguard Matt Peulen monitors the pool at the Lone Tree Recreation Center during a morning aqua fitness class on Feb. 22, 2018 in Lone Tree. Lifeguard Matt Peulen monitors the pool at the Lone Tree Recreation Center during a morning aqua fitness class on Feb. 22, 2018 in Lone Tree.
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