This paper presents the results of an experimental study on the hydraulics of culvert fishways with spoiler baffles. Four designs were studied with the heights of the baffles equal to 0.09Dand 0.15Dand longitudinal spacings of 0.53Dand 1.06D, whereDis the diameter of the culvert. Design equations have been developed relating the flow depth to the flow rate, the diameter and the slope of the culvert for each baffle design. Expressions have also been found for the barrier velocity.Key words: culverts, fishways, hydraulics, turbulent flow, open-channel flow.