The Preble 's meadow jumping mouse has been documented in eleven Wyoming and Colorado counties , as far north as Wyoming 's Converse to Colorado 's El Paso in the south . In Colorado , known habitat areas include the Rocky Flats National Wildlife Refuge , South Boulder Creek and the St. Vrain Valley . Since the devastating 2013 floods , the mouse has no longer been observed at Rocky Flats ; in 2017 , surveyors put out 200 traps a night for a week and caught no mice in an area where they had previously caught an average of 44 . While South Boulder Creek populations are in decline , St. Vrain Creek mice are doing much better ; post-flood restoration has enhanced the habitat with shrubs and trees
2013 floods
2013 Colorado floods
Preble's meadow jumping mouse