In the early 1800s, the local Karamu Stream was part of the much larger Ngaruroro River system. It was termed the "River Plassey", the same name also being applied to a street in the village after the battle of Plassey of 1757 near Calcutta. Early survey plans of Havelock North show ferry landings where boats would sail up and down the river to collect and deliver supplies. This practice was phased out in the 1880s, when a number of large floods diverted the Ngaruroro River to its current course further north away from Havelock North. Later, during the 1931 earthquake, a bridge over the Karamu was completely destroyed.