In 1855 John Rochfort became an approved surveyor, contracting work for the Nelson provincial survey department. His work took him to
Golden Bay in the west of the province and to the Sounds in the east. In late 1861 he explored a route from the
Grey Valley on the West Coast to the Hanmer Plain on the East Coast via the Amuri Pass. He held off giving details of the discovery until the Provincial Government promised him payment. Afterwards he was hired to make a track along the route, and at about that time he became employed full time as an assistant provincial surveyor. He spent most of the year engaged on Canterbury’s portion of the West Coast, where he witnessed a large influx of population as several gold rushes took place. During 1865 his work on the West Coast included laying out the town of
Greymouth. By the end of 1865 he was living in Halswell near
Christchurch, where he continued working for the Canterbury Provincial Government until 1869. In 1874 Rochfort became the engineer for the Timaru and Gladstone Board of Works in
South Canterbury. He was employed there until 1876, when the department was dissolved due to the
abolition of the provinces. Afterwards he returned to Nelson, where he established a private practice and was variously employed on jobs for Road Boards or mining companies. Rochfort had initially left his Nelson business temporarily, but having completed the survey at the end of 1884, he was employed as an engineer to form the Main Trunk Line. He sold his business and made his move to the
North Island permanent, despite his family staying in Nelson. Afterwards he based himself in
Kihikihi near Te Awamutu, where he contracted surveys for the
Native Land Court. == Family and death==