Between 1853 and 1855 he held the position of engineer and surveyor for the Steam Navigation Board and from 1855 to 1858 was engineer on the Hunter River improvements. He was then appointed Engineer-in-Chief for Harbours and River Navigation with the NSW Department of Works from 1858 to 1859. While in the military, in the 1850s (and with approval), he undertook external commissions for the Penrith Nepean Bridge Co. and the first Pyrmont Bridge in 1866. In 1862 Moriarty was made commissioner for roads and engineer-in-chief. He was a
Sydney Water Supply Commissioner in 1868, president of the
Hunter River Floods Commission in 1869–70, and also responsible for water supply schemes for Albury, Bathurst, Hunter Valley towns, Wagga Wagga and Wollongong. Part of the remaining north training wall is still called “Moriarty’s Wall” in recognition of his role. ==Personal interests==