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001692 Revised Supplemental Draft Environmental Assessment-Chapter 3-Affected Environment and Environmental Consequences Conventional Fish Ladder: As with the No Action alternative, construction of a fish ladder around the dam would provide no recreation benefit. Downstream Rock Fish Passage: This alternative would also provide no recreational benefit. However, this alternative would not prohibit recreation enhancements from occurring in the future after construction of the fish passage. This alternative would address boating safety issues with warning signs posted upstream of the dam and 'a log boom type barrier installed upstream of the fish passage exit to prevent boaters from attempting to float through the fish passage. The fish passage channel would not be safe for boat passage and boaters would need to portage around the dam. Future recreational enhancements funded with non-Recovery Program funds could improve the remaining portion downstream of the dam as long as it did not interfere with the operation and structural integrity of the fish passage. This would also require approval from the dam owners, underlying fee title land owners, and the Recovery Program. A possible boater put-in site is located about three miles upstream at Colorado River State Park-Island Acres. No other public access is located upstream between the Price-Stubb Diversion Dam and the Grand Valley Project Diversion Dam. Unauthorized access to the river from Interstate 70 and the Cameo Bridge may occur. Downstream Rock Fish Passage with Whitewater Recreation Features: This alternative would provide a 550 foot rock-ramp as a basis for recreation enhancement. Whitewater features would be constructed on the rock-ramp with non-Recovery Program funding. This would enable the whitewater features to be constructed at a lower cost to recreational interests because the site would already be dewatered for fish passage construction, provides cost savings on volume of material purchased, and the potential to share contract administration and construction mobilization costs. Recreational boating would increase when compared to the Conventional Fish Ladder and Downstream Rock Fish Passage alternatives. The amount of recreation use would be limited because the only upstream public access available would be from Colorado River State Parks-Island Acres. Some trespass along Interstate 70 and at the Cameo Bridge to access the river above the Price-Stubb Diversion Dam would also occur. In addition, some kayak boaters would likely trespass on CDOT property once they floated over the whitewater features to re-enter above the Price-Stubb Diversion Dam to rerun the white water features. Local recreational interests (i.e. WATER) envision a world-class whitewater park using the whitewater features to host major events. It is unlikely that this scale of recreation could be feasible without public access granted from CDOT, which owns a majority of the property downstream of the Price-Stubb Diversion Dam. Additional discussion is provided in the Cumulative Impacts section ofthis chapter. Dam Removal: As stated in a January 1991 letter from Gary M. Lacy, P.E., removing the dam could create a naturally appearing, navigable segment of the river. This would open a spectacular canyon segment of the Colorado River to recreationaL.. boating." A possible put-in site is about 3 miles upstream at Colorado River State Park-Island Acres, from which boaters could float down the river to a variety of take-out points. Popular day use take-outs include Palisade; Colorado River State 33