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Analyzing the 2026 Seven-Day Fish Count at Bonneville Dam: A Technical Field Report

"The Bonneville Dam, situated on the Columbia River between Oregon and Washington, serves as a critical nexus for Pacific Northwest fisheries management and hydroelectric operations. As of 2026, the real-time monitoring of fish passage remains the primary mechanism for adjusting spillway operations and maintaining compliance with the Endangered Species Act (ESA) and the National Marine Fisheries Service (NMFS) biological opinions. This report provides a technical breakdown of how to interpret the 7-day fish count data and the operational significance for the 2026 migration season. Operational Significance of Real-Time Counting Metrics The seve..."

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