Boulder County was worst hit Attack , with recorded Recording September 12 and up to of rain recorded Recording by September 15 , which is comparable to Boulder County 's average annual precipitation ( 20.7 inches , 525 mm ) .

Boulder County was worst hit Attack , with recorded Recording September 12 and up to of rain recorded Recording by September 15 , which is comparable to Boulder County 's average annual precipitation ( 20.7 inches , 525 mm ) .

Governor John Hickenlooper declared Expressing_publicly a disaster Catastrophe emergency Emergency on September 12 , 2013 , in 14 counties : Adams , Arapahoe , Broomfield , Boulder , Denver , El Paso , Fremont , Jefferson , Larimer , Logan , Morgan , Pueblo , Washington and Weld .