The primary objective of this project is to increase the likelihood that the entire Chinook salmon run is fully estimated at both the Pilot Station and Eagle sonar projects, by beginning operations early enough to assess the front end of the run. Early project operations will improve the completeness and utility of information provided to U.S. and Canadian fisheries managers and researches tasked with endeavoring to achieve the objectives set forth in the Yukon River Salmon Agreement between the U.S. and Canada. The estimates from the extended period will be reported to fishery managers and stakeholders daily, archived in the Arctic- Yukon-Kuskokwim Database Management System (AYKDBMS), and included in the annual project report.