In order to make the Kaweah Delta suitable for agriculture and eventually urban development, the tangle of diverging seasonal channels and marshes had to be drained and diked extensively. As early as the 1870s local irrigation companies were dredging some creeks and blocking off side channels in order to direct floodwater away from farms. A major early 20th century project was the channelization of Mill Creek, which runs through the middle of Visalia and posed a major flooding threat before it was straightened, deepened and widened in 1910 at a cost of $70,000. Dams were built in the 1920s and 1930s at McKays Point to divide water flow between the Kaweah and St. Johns Rivers, to satisfy downstream water rights. Today, the Kaweah Delta has very little resemblance to historic times; most of the streams have either disappeared or been channelized, and Tulare Lake itself is now a dry, diked basin that only very occasionally floods.