Preliminary evaluation of the new juvenile collection, bypass, and sampling facilities at McNary Dam, 1994

We conducted research to evaluate the new juvenile fish bypass system at McNary Dam, which was completed and began operating in spring 1994. Our evaluations at McNary Dam in 1994 were intended to accomplish the following objectives: 1) to determine if mechanical problems existed in the new facility that might affect fish passing though its channels, flumes, and pipes, 2) to determine the accuracy of the facility sampling system, and 3) to determine if the outfall pipe safely passed juvenile fish. We accomplished part of the first and third objectives and all of the second objective during 1993 evaluations, and in 1994, we completed evaluations for all remaining objectives. Results for the work completed in 1993 were described in a previous report (Marsh et al. 1995). Following is a summary of major findings under Objectives 1, 2, and 3 which were accomplished in 1994. Contract no. DACW68-84-H-0034