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美国陆军工程师团在拆除斯内克河下游大坝潜在影响的初步分析报告中认为 ,拆除这些坝可能会使大量泥沙涌入哥伦比亚河 ,并沉积于麦克纳里坝和约翰日坝坝后。下泄泥沙可能堵塞用于灌溉的水泵 ,并需疏浚航道。幼鲑鱼的栖息地也可能被泥沙掩埋。支持拆坝的水土保持专家承认 ,鲑鱼
According to a preliminary analysis by the Army Corps of Engineers on the potential impact of dismantling the downstream Snake River, the dismantling of these dams would flood large amounts of sediment into the Columbia River and deposit behind the McNally and Damier Dam. Sediment discharge may plug water pumps for irrigation and dredge waterways. The habitat of young salmon may also be buried by sediment. Soil and water conservation experts who support demolition of the dam recognize salmon