River systems in the Great Plains region are heavily fragmented by potential instream barriers to movement such as low-head diversion dams. The longitudinal connectivity of these systems can be restored with the use of fish passage structures that are designed to allow passage of native fishes, but data on appropriate design requirements are lacking. The proposed project will measure the passage success of 3 species of Great Plains fishes (1 darter, 1 minnow, and 1 catfish in the madtom group) as function of rock ramp fishway slope and sinuosity, two of the key design parameters for an effective fishway. The project will use a model fishway with variable slope and sinuosity and integrated PIT tag antennas to monitor fish movements and identify combinations of fishway slope and sinuosity that maximize passage of the target species. The ultimate deliverable of the project will be recommendations on effective fishway designs that can be used to improve connectivity of Great Plains streams and rivers by mitigating the barriers to movement.