The citation, on an adjacent plaque, reads
Contractor Lane and Peters completed this basalt concrete faced sandstone-block masonary dam in 1907 for the NSW Public Works Department to a design by Principal Engineers L. A. B. Wade and T. W. Keele. It was the first large city water storage dam in Australia, the fourth largest of its type in the world and the first of the four Upper Nepean Dams which provided water reserves for Sydney against the effects of drought.