Organized in 1924 under Irrigation District Law, WID has the authority to divert water from the Mokelumne River (Lodi Lake) and provide water service within its geographic boundaries (an area of approximately 63 square miles). This water service area constitutes approximately 4% of the area of San Joaquin County, west of the City of Lodi and north of the City of Stockton. The WID service area includes the unincorporated communities of Woodbridge and Thornton, and small portions of the incorporated municipalities of Lodi and Stockton.
WID diverts its water primarily from the Mokelumne River at the Woodbridge Diversion Dam under pre-1914 and post-1914 appropriative rights. These rights provide for the diversion of 300 Cubic Feet per Second (CFS) from February 1 to October 31, and for an additional 114.4 CFS from May 1 to August 31 of each year and from November 1 of each year to January 31 of the succeeding year. The combined pre-1914 and post-1914 water rights are limited in the aggregate to a maximum diversion of 414.4 CFS.
Governed by a Board of Directors, and operated by managerial, administrative, and maintenance personnel, WID develops and maintains a network of water storage and delivery infrastructure to guarantee the efficient provision of water to its agricultural and municipal clients.
WID owns and operates a significant amount of infrastructure required to maintain the flow of high quality Mokelumne River water to its customers. These assets include the Woodbridge Diversion Dam that impounds Lodi Lake, the Moffit Weir on Pixley Slough, the Beaver Slough pump diversion, and a system of canals and pipelines for the purpose of providing water deliveries primarily to agricultural users within the District’s service area. The existence of Lodi Lake provides the necessary flows through the main diversion canal in Woodbridge, which runs underneath Lower Sacramento Road and feeds the vast network of the canals to the north, west, and south. Fish migrating up and down the Mokelumne River are protected from access to the canal system from a state of the art fish screen at the entrance to the diversion canal from Lodi Lake.
Approximately 13,000 acres of farmland are supplied with Mokelumne River water by WID, which produce various crops, such as grapes, corn, alfalfa, tomatoes, walnuts, etc.… Historically, WID has served the local agricultural community with water that is critical in producing the crops in this area. However, with advancements in irrigation technology resulting in less water being used, WID is now also providing water to the Cities of Lodi and Stockton for municipal use.