The Murrumbidgee to Googong water transfer pipeline had the potential to transfer larval fish and eggs from the Murrumbidgee River into Burra Creek and then ultimately Googong Reservoir. It also had the potential to locally impact larval fish (primarily cod species) in the Murrumbidgee River, through impingement of fish and eggs on exclusion screens placed around each pump intake. The aim of this project was to determine the efficacy of fish screens to exclude fish and eggs from being transferred between catchments, and to determine the incidence of fish impingement on exclusion screens. Larval drift nets were set three sampling sites (Murrumbidgee River upstream of transfer intake; screen flushing outlet and Burra Creek pipeline outlet) in early December 2013. Larval fish were detected at the screen flushing outlet, indicating that fish had been impinged. No fish were detected at the Burra Creek pipeline outlet, indicating that the screens were effective at preventing cross-catchment transfer at the level of pumping assessed.