The exploitation of riverine systems for renewable energy has resulted in large numbers of small-scale hydropower schemes on low-head weir. Although considered a clean and ‘green’ energy source in terms of emissions, hydropower can impact upstream migrating species by diverting flow away from viable routes over the impoundment and attract fish towards the turbines outfall. In an attempt to reduce this negative effect, hydropower outfalls with co-located fish passage entrances are recommended; utilising turbine flows to attract fish towards the fish pass. This study used acoustic telemetry to understand the performance of a co-located Larinier fish pass at a low-head hydropower scheme at a weir on the tidal Yorkshire Esk, England. The majority of the sea trout (anadromous Salmo trutta L.) that approached the impediment were attracted to the hydropower and co-located fish pass. Fish ascended through the pass under a wide range of river flows, tide heights, downstream river levels and hydropower flows, and there was no evidence that the hydropower operation affected fish pass ascent. The information presented is urgently required to inform management decisions on the operation of hydropower schemes during the migratory period of salmonid fish, and help determine best practice designs and operation at these facilities.