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Revised Supplemental Draft Environmental Assessment-Chapter I-Introduction Recreation Resources River Boating-historically, the dam has been a barrier to recreational boating. This fish passage project could affect future recreational boating along the Colorado River in the vicinity of the Price-Stubb Diversion Dam. This Draft EA evaluates potential impacts associated with Colorado Department of Transportation approval or disapproval of whitewater recreational features designed to enhance river recreation opportunities. Public Safety-the dam poses a significant safety threat to all forms of water recreation in the vicinity of the dam. Land and Facility Resources Protect Existing Structures-the nearby Interstate 70, railroad, and Colorado River Siphon were designed and constructed with the dam in place. Evaluating the effects of the alternatives on the integrity and use of these structures is necessary. Railroad and Landslide Stability- Union Pacific Railroad tracks run along the Colorado River past the Price-Stubb Diversion Dam. Fish passage alternatives could affect the stability of an existing landslide area and railroad. The landslide has previously caused damage to the tracks. Ownership of Dam and Lands-before any modification to the dam and site could be made, permission would be needed from the dam owners and adjacent land owners to access the site and/or use their land and facilities. Unique Geographic Features Floodplain and Wetland Protection-The Colorado River provides highly valued riparian habitat and floodplain functions that need to be considered as fish passage is restored. Fish and Wildlife Resources Effects on Endangered Colorado River Fishes-providing passage at the dam is needed to allow endangered fish access to upstream habitat (see background information on page 3). Passage actions should complement other Recovery Program efforts such as stocking endangered fish, controlling competition or predation by nonnative fish, and restoring habitat. 5