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r, f Public and private waters that have a direct connection to rivers in the Upper Colorado River Basin (e.g., Elkhead Reservoir, Highline Reservoir, and many ponds) will be equipped or managed with an anti-escapement device or practice ' acceptable to the Service and the State fish and wildlife agency. Lake Management Plans will be prepared or revised and approved by the Service and the State fish and wildlife agency before the continued stocking of nonnative, warmwater fish species will be allowed. The Program will pursue funding for equipping public reservoirs with anti-escapement devices. Stocking of nonnative fishes in public waters, not prohibited, that are not managed in the Upper Basin at the present time will require evaluation by the State wildlife agency and the Service on a case-by-case basis to ensure that the proposed stocking of these fishes will not adversely affect the endangered fishes. Minimum criteria for stocking will include: 1) no stocking of isolated ponds within the 50-year floodplain and 2) if the water has an outlet it must be screened or managed to control escapement. Stocking should be "confined to areas where absence of potential conflict with rare or endangered species can be demonstrated" (U.S. Fish and Wildlife Service 1987). The intent here will be to address escapement potential. 1 1 1 The States and the Service recognize that introducing new fish species, including hybrids, into an ecosystem can result in unanticipated impacts on native fishes. For this reason, few proposals, if any, to introduce new fish species or hybrids into the Upper Basin are anticipated. Introduction of new species will generally be discouraged. Minimum criteria for stocking will include: 1) no stocking of isolated ponds within the 50-year floodplain and 2) if the water has an outlet, it must be screened or managed to control escapement. Stocking should be "confined to areas where absence of potential conflict with rare or endangered species can be demonstrated" (U.S. Fish and Wildlife Service 1987). Proposals to stock fishes that do not presently occur in the basin will be subject to case-by-case review by the State wildlife agency and the Service and will include the following minimal information: A. The purpose and location of the proposed stocking. B. The species, numbers, and rationale for selecting the species. C. The potential for escapement, the potential for survival in critical habitat if escapement occurs, and control measures that could be implemented to reduce the risk of escapement. D. The potential for impact to threatened and endangered species and the specific measures available to remedy any impacts that may occur including their feasibility and likelihood of success. E. A plan for monitoring the effects of stocking nonnative fishes on the endangered Colorado River fishes. 12