The subject line of a press release this month from Weld County was stark and foreboding: “County’s assessed value sees 20% decrease.” The cratering of taxable property value in the large county that hugs metro Denver’s northeast corner — from nearly $25 billion in 2023 to just under $20 billion this year — would probably send many county finance directors running to the medicine cabinet for a fistful of antacids. But for Cheryl Pattelli, it’s all part of managing the books for a county whose economy relies largely on boom-and-bust commodity industries, like agriculture and energy, that can experience wild swings in both price and production. Energy, in particular, plays an outsized role.