Colorado Parks and Wildlife has expanded the area of the Colorado River labelled “infested” with zebra mussels. The area extends from the confluence of the Eagle River down to the Colorado-Utah border. The designation comes after CPW sampled four Western Slope rivers — the Eagle, Gunnison, Roaring Fork and Colorado rivers — on Oct. 29. The Yampa River feeds the Colorado through the Green River, and faces threats of its own, apart from zebra mussels. …. Of the five main aquatic nuisance species closely monitored by CPW — Eurasian watermilfoil, ​​​​​​​​​​​​​​​New Zealand mudsnails, quagga mussels, rusty crayfish and zebra mussels — only the crayfish is identified in the Yampa, and has been since 2009.