During work on the Glendale Water Supply Improvement Project in the Reno and Sparks Nevada area on the Truckee River we were involved in the fish passage Monitoring and Evaluation of the project. We developed a methodology to measure success, delay or failure of fish passage across a diversion or river reach of interest. The techniques we used were to employ hydro-acoustic tags manufactured by Vemco. In this presentation I would like to present some results of that study and to discuss the large amount of information that can be gained with this method of measurement. This data set can be used to establish some fish passage efficiency statements and fish swimming speed thresholds, possible energetic thresholds and just plain speculation on fish passage behavior. Speculation on behavior! How dare me! I’ll try to make this fun but useful with data from our work. We will investigate the ideas of fish swimming speeds, V occupied, and my favorite, (Kidder’s words) fish’s eye velocity; roughened channel slopes and velocities, physical hydraulic modeling, and Vemco receiver placement methods. I would like to pose several requests and questions about how we grow our fish passage criteria in real life systems and manmade built solutions so that we can bridge the biology of the fish, fish passage, migration and the constructed projects that we get involved in. This balance of measured results and the development of criteria will help designers build fish passages systems that really work. There is a time and place for each type of fish passage system, but with good criteria we can continue into the future with roughened channels that are designed properly for fish passage for target species.