The Kaweah Delta (historically also known as the "Four Creeks area", after the four major branches of the Kaweah River) was one of the earliest places in the San Joaquin Valley to be populated and farmed by U.S. settlers, although before the construction of Terminus Dam the entire area was frequently flooded; the Great Flood of 1862 temporarily changed the course of the river, creating the distributary today known as St. John's River. Agriculture began in the Kaweah Delta around 1864 when a group of local farmers dug the Consolidated Peoples' Ditch. The people of Visalia hired Native Americans to extend a canal from Mill Creek to power the expanding settlement's flour mill. In addition, multiple channels had to be dug to redirect the flow of St. John's River back into the Kaweah, which had been blocked by sediment during the 1862 flood. It was not until after the Wright Act of 1887, however, that farming expanded significantly. The Wright Act allowed the formation of the Tulare Irrigation District, which began to establish a network of canals across the Kaweah Delta. Surface water provided the main supply as late as 1900, after which the area's abundant groundwater reserves were pumped at increasing rates. Tulare Lake disappeared by the early 1900s, and by the 1930s, agricultural development had surpassed the capacity of local water resources.