Renmark. The original Renmark High School now derelict. Renmark High opened in 1925. This building opened in 1929. It was vacated around 1980. . Image by denisbin Renmark dates from 1888 when the Chaffey brothers got their irrigation settlement under way. Renmark is the oldest of the SA Riverland towns. But before the town was established Renmark was good pastoral country. … [Read more...] about Renmark. The original Renmark High School now derelict. Renmark High opened in 1925. This building opened in 1929. It was vacated around 1980. .