Colorado wildlife officials keep putting up geographic and psychological barriers to the noxious water weed Eurasian watermilfoil, and the voracious invader keeps busting right through.  The fast-growing water floater — the bane of Colorado handlers for nearly two decades — now has been found in Pueblo’s Fountain Lake, near the Interstate 25 and U.S. 50 intersection, and its outlet into the broader Arkansas River. The announcement is the first major spread of milfoil in Colorado since a 2022 invasion of Boulder Reservoir, and opens up the southeastern part of the state to all sorts of trouble.