Abstract: In the summer of 2014, an extensive hydraulic development was completed for replacement fixed and adjustable blade turbines for the US Army Corps of Engineers’ (USACE) Ice Harbor Lock and Dam. During the hydraulic design phase, fish passage considerations made up the primary evaluation criteria, including minimum pressures, shear, flow quality, and blade strike. Expected fish passage characteristics for each set of proposed geometries were evaluated using both Computational Fluid Dynamic (CFD) calculations and physical model testing. Turbine performance characteristics, such as power and efficiency, were also considered as secondary evaluation criteria. For both machine types, several design and test loops were completed. At the end of each iteration, the design team, consisting of engineers and biologists from the USACE, Voith Hydro, and the National Marine Fisheries Service (NMFS), evaluated the results and identified aspects of the fish passage environment that could be improved. As the design process neared completion, final improvements to the overall fish passage environment involved making compromises between the individual design criteria. The current paper presents computational and model test results to illustrate the detailed design and evaluation process, including the trade-offs that were made leading up to the selection of the final prototype fixed blade turbine geometry. Comparison of the fish passage evaluations for the fixed blade solution with those of the existing Ice Harbor Kaplan geometry shows significant potential for fish passage improvement.